diff --git a/A00_Common/design/logic/design_calc_registry_facility.ts b/A00_Common/design/logic/design_calc_registry_facility.ts
index a0169494c..da11ddc46 100644
--- a/A00_Common/design/logic/design_calc_registry_facility.ts
+++ b/A00_Common/design/logic/design_calc_registry_facility.ts
@@ -212,10 +212,10 @@ export const FACILITY_ROWS: readonly CalcEntry[] = [
     site: "server_only",
     stage: null,
     ts: null,
-    runner: `py:${U}common_util_drainage_detail.py#suggest_pipe_positions`,
+    runner: `py:${U}common_util_stream_crossing.py#propose_pipes`,
     pair: null,
     mirror: [],
-    note: "TS 는 모으기만(B05_Profile/logic/B05_Profile_Drainage_Suggest.ts)",
+    note: "[자동 제안](510) — TS 는 후보 그리기 · 고름만(B05_Profile/B05_Profile_UI_Drainage_Propose.ts)",
   },
   {
     id: "corridor.mesh",
diff --git a/B04_PreProcess/B04_PreProcess_Api_Fetch.ts b/B04_PreProcess/B04_PreProcess_Api_Fetch.ts
index 6106be9bc..7fafa6703 100644
--- a/B04_PreProcess/B04_PreProcess_Api_Fetch.ts
+++ b/B04_PreProcess/B04_PreProcess_Api_Fetch.ts
@@ -525,6 +525,8 @@ export interface DetailPipePoint {
   summary_item?: SummaryItem | null;
   /** 옵션 그룹마다 고른 집계 항목 `{그룹 id: 참조}`(PLAN 46-3) — 없으면 그룹 미지정. */
   group_items?: GroupItems | null;
+  /** 자동 세류선 관 라벨(507-2 · `{stream, order, x, y}`) — 서버 정본 · 화면은 실어 나르기만(510). */
+  stream_label?: Record<string, string | number> | null;
 }
 
 /** 편집·저장 요청에 싣는 관 1건 — 좌표(lonlat)는 서버가 다시 계산하므로 뺀다. */
diff --git a/B04_PreProcess/B04_PreProcess_Router_Basins.py b/B04_PreProcess/B04_PreProcess_Router_Basins.py
index eb85536ba..305dfa617 100644
--- a/B04_PreProcess/B04_PreProcess_Router_Basins.py
+++ b/B04_PreProcess/B04_PreProcess_Router_Basins.py
@@ -37,6 +37,7 @@ from common_util.common_util_drainage_detail import (
     DrainageDetail,
     build_detail,
     pipes_from_chainages,
+    read_road_routing,
 )
 from common_util.common_util_drainage_pipes import (
     PIPE_SOURCE_USER,
@@ -57,7 +58,7 @@ from common_util.common_util_drainage_pipes import (
 )
 from common_util.common_util_json import LONLAT_DIGITS, round_floats
 from common_util.common_util_route_geometry import StructureCandidate
-from common_util.common_util_stream_crossing import keep_labels
+from common_util.common_util_stream_crossing import keep_labels, propose_pipes
 from config.config_system import (
     DRAINAGE_PIPE_MAX_SPACING_M,
     DRAINAGE_PIPE_MIN_SPACING_M,
@@ -645,3 +646,47 @@ async def put_pipe_points(
     result["snapshot_failed"] = failed  # 못 만든 구조물 조합 복사본(142-2) — [저장] 알림
     result["stations_failed"] = not stood  # 측점 맞춤 실패(433-6) — [저장] 알림
     return result
+
+
+@router.post("/{project_id}/drainage/pipe-proposals", response_model=None)
+async def post_pipe_proposals(
+    project_id: UUID, payload: dict[str, Any] | None = None
+) -> dict[str, Any] | JSONResponse:
+    """[자동 제안](510) — 지금 노선 × 세류선 교차 + 간격 보충 후보와 상태 · 아무것도 안 씀.
+
+    `points` = 화면 관 목록(없으면 저장분) · 화면에서 지운 자동 관도 지움 표지로 봄(`keep_labels`).
+    간격 보충은 분석이 지금 노선일 때만(`spacing` 거짓 = 교차만).
+    """
+    from B04_PreProcess.B04_PreProcess_Engine_Watershed_Analyze import _base_pipes
+    from B04_PreProcess.B04_PreProcess_Router_Watershed import _prepare
+
+    context, reason = await load_drainage_context(project_id)
+    if context is None:
+        return JSONResponse(status_code=404, content={"status": "error", "message": reason})
+    path = pipe_points_path(context.stored_path)
+    stored = read_pipe_points_file(path)
+    try:
+        raw = (payload or {}).get("points")
+        points = (
+            load_pipe_points(
+                context.stored_path, route_signature(context.vertices), context.vertices
+            )
+            or []
+            if raw is None
+            else parse_pipe_points(raw)
+        )
+    except ValueError as error:
+        return JSONResponse(status_code=400, content={"status": "error", "message": str(error)})
+    dismissed = read_dismissed(path)
+    keep_labels(points, stored, dismissed)
+    prepared = await _prepare(project_id)
+    streams = [] if isinstance(prepared, JSONResponse) else prepared["streams"]
+    fresh = analysis_route_signature(context.stored_path) == route_signature(context.vertices)
+    routing = read_road_routing(drainage_dir(context.stored_path)) if fresh else None
+    curve = routing.strength_curve if routing is not None else None
+    proposals = await asyncio.to_thread(
+        lambda: propose_pipes(
+            context.vertices, _base_pipes(context.vertices, streams), points, dismissed, curve
+        )
+    )
+    return {"status": "success", "proposals": proposals, "spacing": curve is not None}
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Chrome.ts b/B05_Profile/B05_Profile_UI_Drainage_Chrome.ts
index 7a82c1545..2bf510e3d 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Chrome.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Chrome.ts
@@ -21,7 +21,7 @@ export interface DrainageChrome {
   analyzeButton: HTMLButtonElement;
   deleteButton: HTMLButtonElement;
   autoButton: HTMLButtonElement;
-  /** [자동 제안](369) — 고름 창 · 배선은 `B05_Profile_UI_Drainage_Live`. */
+  /** [자동 제안](510) — 후보 목록 · 배선은 패널(`B05_Profile_UI_Drainage_Propose`). */
   proposeButton: HTMLButtonElement;
   viewport: HTMLElement;
   backgroundImage: HTMLImageElement;
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Facility.ts b/B05_Profile/B05_Profile_UI_Drainage_Facility.ts
index f2cf3a0dc..14e7ebcea 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Facility.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Facility.ts
@@ -94,11 +94,13 @@ export interface FacilityAttributes {
   summary_item?: SummaryItem | null;
   /** 옵션 그룹마다 고른 집계 항목(PLAN 46-3) — 없음 = 그룹 미지정. */
   group_items?: GroupItems | null;
+  /** 자동 세류선 관 라벨(507-2) — [자동 제안]으로 넣은 관 · 응답 · 초안 왕복에 실어 나름(510). */
+  stream_label?: DetailPipeInput["stream_label"];
 }
 
 /** 확장 정보가 실제로 있는지 — 배관이면서 아무 부속도 없으면 보관할 이유가 없다. */
 function hasExtras(attributes: FacilityAttributes): boolean {
-  if (hasLinks(attributes)) return true; // 집계 항목(본체 · 그룹)만 지정한 맨 배관도 보관한다
+  if (hasLinks(attributes) || attributes.stream_label) return true; // 집계 항목 · 라벨만 있어도
   if (attributes.facility !== "pipe") return true;
   if (attributes.start_m !== undefined || attributes.end_m !== undefined) return true;
   return !!attributes.options && Object.keys(attributes.options).length > 0;
@@ -134,17 +136,7 @@ export function createFacilityStore() {
 
   return {
     /** 서버 응답으로 전체를 다시 채운다 — 응답이 정본이다. */
-    replaceFromResponse(
-      points: ReadonlyArray<{
-        chainage_m: number;
-        facility?: PipeFacility;
-        start_m?: number;
-        end_m?: number;
-        options?: Record<string, string | number>;
-        summary_item?: SummaryItem | null;
-        group_items?: GroupItems | null;
-      }>,
-    ): void {
+    replaceFromResponse(points: ReadonlyArray<Omit<DetailPipeInput, "source">>): void {
       entries = points
         .map((point) => {
           // 응답이 정본이다 — 서버는 미지정이면 칸을 안 싣는다(`as_dict`). 예전엔 칸이 없으면 화면이 쥔
@@ -156,6 +148,7 @@ export function createFacilityStore() {
               start_m: point.start_m,
               end_m: point.end_m,
               options: point.options,
+              ...(point.stream_label ? { stream_label: point.stream_label } : {}),
               ...linkFields(point),
             } as FacilityAttributes,
           };
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Live.ts b/B05_Profile/B05_Profile_UI_Drainage_Live.ts
index 0a92686af..e3a4116aa 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Live.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Live.ts
@@ -14,10 +14,10 @@
  *   - 서버가 「낡음」으로 답하면(노선 [저장] 뒤 등) 같은 흐림 + [업데이트] · 자동이면 3 s 뒤.
  *   - 답은 패널 요청 감싸기(`DetailRunner`, quiet)로 올림 — 옛 차례 · 서버가 그만둔 답은 버림.
  *   - 덮개 · 잠금 없음 — 다른 칸 조작은 그대로.
- *   - [자동 제안](369) — 고름 창 ① 전체 자동(all) ② 지정 포함 추가(add) · [배관 배치 초기화] = 세류선 교차
- *     관만 · 셋 다 초안(세션) · [저장] 때 정본 · 답이 오면 사진첩 한 걸음(늦은 답도 앞 걸음에 안 묻힘) ·
- *     낡은 동안 [자동 제안] 끔 · 노선 초안 중이거나 저장 분석이 낡았으면(옛 노선) 「지금 노선으로 셈」 길에
- *     방식을 실어 보냄(저장 분석으로 셈 = 옛 노선 자리 · 409).
+ *   - [배관 배치 초기화] = 세류선 교차 관만 · 초안(세션) · [저장] 때 정본 · 답이 오면 사진첩 한 걸음(늦은
+ *     답도 앞 걸음에 안 묻힘) · 노선 초안 중이거나 저장 분석이 낡았으면(옛 노선) 「지금 노선으로 셈」 길로
+ *     (저장 분석으로 셈 = 옛 노선 자리 · 409).
+ *   - [자동 제안](510 · 후보 목록 = `B05_Profile_UI_Drainage_Propose`) — 낡은 동안 끔 · 낡으면 목록 닫음.
  * ========================================================================== */
 
 import { API_BASE_URL } from "@config/config_frontend";
@@ -56,6 +56,8 @@ export interface DrainageLiveDeps {
   rememberPipes: () => void;
   /** 저장 배수유역 다시 받기(열 때와 같은 길 · 조용히) — 답을 화면에 올렸으면 true. */
   loadSaved: () => Promise<boolean>;
+  /** 노선 · 관 자리가 바뀌어 낡음 — [자동 제안] 목록 닫기(510). */
+  onStale?: () => void;
 }
 
 export interface DrainageLive {
@@ -100,8 +102,8 @@ const L = (key: keyof typeof ui_locales): string => ui_locales[key][currentLangu
 /** 서버 「낡음」 글 머리 — 짝 `B04_PreProcess_Router_Basins.STALE_MESSAGE`. */
 const STALE_PREFIX = "배수유역 낡음";
 
-/** [자동 제안] · [배관 배치 초기화] 요청 — 관 목록 없음(null) = 세류선 교차만. */
-type Proposal = { points: DetailPipeInput[] | null; auto?: "all" | "add" };
+/** [배관 배치 초기화] 요청 — 관 목록 없음(null) = 세류선 교차만. */
+type Proposal = { points: DetailPipeInput[] | null };
 
 export function createDrainageLive(deps: DrainageLiveDeps): DrainageLive {
   const viewport = deps.root.querySelector<HTMLElement>(".b05-drainage__viewport") as HTMLElement;
@@ -129,7 +131,7 @@ export function createDrainageLive(deps: DrainageLiveDeps): DrainageLive {
   let drafted = false;
   /** 저장분 다시 받기 답이 「낡음」이었나(`markStale` 이 세움). */
   let savedStale = false;
-  /** 저장 분석이 옛 노선(서버 「낡음」 답 · [확정] 전까지) — [자동 제안]은 지금 노선으로 셈. */
+  /** 저장 분석이 옛 노선(서버 「낡음」 답 · [확정] 전까지) — [배관 배치 초기화]는 지금 노선으로 셈. */
   let analysisStale = false;
   let generation = 0;
   /** 마지막 단계 입력 지문 — 같으면 묶음이 다시 돈 것뿐. */
@@ -205,13 +207,13 @@ export function createDrainageLive(deps: DrainageLiveDeps): DrainageLive {
       });
   }
 
-  /** [자동 제안] · [배관 배치 초기화] — 저장 분석이 지금 노선과 같으면 빠른 길(detail-basins) ·
+  /** [배관 배치 초기화] — 저장 분석이 지금 노선과 같으면 빠른 길(detail-basins) ·
    *  그 길이 「낡음」(409 · 화면이 아직 몰랐던 낡음)이면 곧바로 지금 노선으로 셈 길로 다시. */
   function proposeDraft(proposal: Proposal): void {
     if (analysisStale || draftMakesStale(route)) return refresh(proposal);
     draft(async (projectId) => {
       try {
-        return await computeDetailBasins(projectId, proposal.points, proposal.auto);
+        return await computeDetailBasins(projectId, proposal.points);
       } catch (error) {
         if (!(error instanceof Error) || !error.message.startsWith(STALE_PREFIX)) throw error;
         analysisStale = true;
@@ -225,6 +227,7 @@ export function createDrainageLive(deps: DrainageLiveDeps): DrainageLive {
   function invalidate(): void {
     cancel();
     stale = true;
+    deps.onStale?.();
     if (mode === "auto") timer = window.setTimeout(refresh, QUIET_MS);
     paint();
   }
@@ -272,36 +275,6 @@ export function createDrainageLive(deps: DrainageLiveDeps): DrainageLive {
     });
   }
 
-  /** [자동 제안] 고름 창 — ⚙ 창과 같은 틀 · 고르면 닫고 그 방식으로 초안. */
-  function openPropose(): void {
-    if (stale) return;
-    openModal({
-      title: L("B05_Drainage_Propose_Title"),
-      closeLabel: "닫기",
-      mount(body, close) {
-        const choices: Array<["all" | "add", string, string]> = [
-          ["all", L("B05_Drainage_Propose_All"), L("B05_Drainage_Propose_All_Hint")],
-          ["add", L("B05_Drainage_Propose_Add"), L("B05_Drainage_Propose_Add_Hint")],
-        ];
-        choices.forEach(([value, label, hint], order) => {
-          const row = document.createElement("label");
-          row.className = "b05-drainage__mode";
-          const input = document.createElement("input");
-          input.type = "radio";
-          input.name = "b05-drainage-propose";
-          input.addEventListener("change", () => {
-            close();
-            proposeDraft({ points: deps.pipeRequest(), auto: value });
-          });
-          const text = document.createElement("span");
-          text.textContent = `${order === 0 ? "①" : "②"} ${label} — ${hint}`;
-          row.append(input, text);
-          body.append(row);
-        });
-      },
-    });
-  }
-
   function setMode(next: DrainageMode): void {
     mode = next;
     writeStateRaw(MODE_KEY, next);
@@ -313,7 +286,6 @@ export function createDrainageLive(deps: DrainageLiveDeps): DrainageLive {
 
   update.addEventListener("click", () => refresh());
   gear.addEventListener("click", openSettings);
-  propose?.addEventListener("click", openPropose);
 
   return {
     stage(ctx) {
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Panel.ts b/B05_Profile/B05_Profile_UI_Drainage_Panel.ts
index a947d28ca..03e9f3ef5 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Panel.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Panel.ts
@@ -30,7 +30,7 @@ import { resampleRoute } from "../B04_PreProcess/logic/B04_PreProcess_UI_RouteSa
 import { batched, createPipeEditor } from "./B05_Profile_UI_Drainage_Pipes";
 import { followMovedPipe, PIPE_MATCH_M } from "../A00_Common/design/design_pipe_ids";
 import { snapStructureStation } from "../common_util/common_util_structure_station";
-import { createFacilityStore } from "./B05_Profile_UI_Drainage_Facility";
+import { createFacilityStore, type FacilityAttributes } from "./B05_Profile_UI_Drainage_Facility";
 import { mergeFacilityOptions } from "./logic/B05_Profile_UI_Drainage_Facility_Merge";
 import { readPendingPipes, writePendingPipes } from "./B05_Profile_Api_Pipes_Draft";
 import { buildPipeReports } from "./B05_Profile_UI_Drainage_Report";
@@ -38,6 +38,7 @@ import { fillFordHeights, fordWaitsOf, waitsFordHeight } from "./B05_Profile_UI_
 import { createDrainageChrome } from "./B05_Profile_UI_Drainage_Chrome";
 import { createDetailRunner } from "./B05_Profile_UI_Drainage_Run";
 import { createDrainageLive } from "./B05_Profile_UI_Drainage_Live";
+import { createDrainagePropose } from "./B05_Profile_UI_Drainage_Propose";
 import { bindDrainageInteractions } from "./B05_Profile_UI_Drainage_Interact";
 import type { RouteSpanBand } from "./B05_Profile_UI_Drainage_Spans";
 import { drawDrainageScene } from "./B05_Profile_UI_Drainage_Render";
@@ -104,6 +105,7 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
     analyzeButton,
     deleteButton,
     autoButton,
+    proposeButton,
     viewport,
     backgroundImage,
     canvas,
@@ -243,7 +245,7 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
       markedChainage,
       stationIntervalM: MAP_STATION_INTERVAL_M,
       intervalSpans,
-      candidates: live.suggest.candidates(),
+      candidates: [...live.suggest.candidates(), ...propose.candidates()],
     });
     updateImageTransform();
   }
@@ -401,11 +403,35 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
     runner,
     rememberPipes: () => (rememberPipes(), callbacks.onPipesDrafted?.()), // + 사진첩 한 걸음(369-4)
     loadSaved: () => run(loadSaved, true), // 초안 버림 = 저장분 조용히(349-0i)
+    onStale: () => propose.close(),
   });
+  // [자동 제안](510) — 서버 후보 · 고른 것만 관 넣기 길(세류선 교차 = 라벨 실음)
+  const propose = createDrainagePropose({
+    projectId: () => projectId,
+    pipeRequest,
+    addPipes: (picks) =>
+      picks.forEach((item) =>
+        addPipe(
+          item.chainage_m,
+          item.stream_label ? { facility: "pipe", stream_label: item.stream_label } : undefined,
+        ),
+      ),
+    redraw: scheduleDraw,
+  });
+  basinList.before(propose.root);
+  proposeButton.addEventListener("click", () => void propose.open());
   analyzeButton.addEventListener("click", () => void analyze());
   deleteButton.addEventListener("click", () => void pipeEditor.deleteSelected());
   autoButton.addEventListener("click", live.resetToStreams); // 세류선만 · 초안(369)
 
+  function addPipe(chainageM: number, attributes?: FacilityAttributes): void {
+    chainageM = snapStructureStation(chainageM); // 관 기준 측점 = 정수 m(234-1)
+    // 시설 정보를 먼저 보관해야 addAtChainage가 촉발하는 재계산 요청에 실려 간다.
+    facilityStore.set(chainageM, attributes ?? null);
+    if (waitsFordHeight(attributes?.facility, attributes?.options)) fordWaits().add(chainageM);
+    pipeEditor.addAtChainage(chainageM);
+  }
+
   /** 노선 전체가 보이도록 배율·중심을 맞춘다(초기 보기 = 도로 기준 줌인).
    *
    *  B05는 노선 주변 배수유역을 보는 화면이라 도로에 맞춰 확대한 상태로 연다
@@ -596,13 +622,7 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
       intervalSpans = spans;
       scheduleDraw();
     },
-    addPipe(chainageM, attributes) {
-      chainageM = snapStructureStation(chainageM); // 관 기준 측점 = 정수 m(234-1)
-      // 시설 정보를 먼저 보관해야 addAtChainage가 촉발하는 재계산 요청에 실려 간다.
-      facilityStore.set(chainageM, attributes ?? null);
-      if (waitsFordHeight(attributes?.facility, attributes?.options)) fordWaits().add(chainageM);
-      pipeEditor.addAtChainage(chainageM);
-    },
+    addPipe,
     updatePipeFacility(fromChainageM, toChainageM, attributes) {
       // 옮겼으면 정수 m · 속성 열쇠도 그 자리로(234-1) — 값만 고친 옛 소수 관은 제자리
       if (Math.abs(toChainageM - fromChainageM) > 0.005)
@@ -610,7 +630,8 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
       // ⚠ 통째로 갈아 끼우지 않음 — 폼이 모르는 칸(집계표로 적은 기초 등)을 지키려 이어 붙임.
       const previous = facilityStore.get(fromChainageM);
       facilityStore.set(fromChainageM, null);
-      facilityStore.set(toChainageM, mergeFacilityOptions(previous, attributes));
+      const label = previous?.stream_label ? { stream_label: previous.stream_label } : {}; // 510
+      facilityStore.set(toChainageM, { ...mergeFacilityOptions(previous, attributes), ...label });
       if (fordWaits().delete(fromChainageM)) fordWaits().add(toChainageM);
       if (Math.abs(fromChainageM - toChainageM) > 0.005) {
         // 기준점이 옮겨졌다 — 관을 이동시키면 onCommit이 재계산을 돌리고,
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Propose.ts b/B05_Profile/B05_Profile_UI_Drainage_Propose.ts
new file mode 100644
index 000000000..469ba638e
--- /dev/null
+++ b/B05_Profile/B05_Profile_UI_Drainage_Propose.ts
@@ -0,0 +1,155 @@
+/* =============================================================================
+ * B05_Profile_UI_Drainage_Propose.ts
+ * 배수유역 칸 [자동 제안](510) — 서버가 후보를 셈(`post_pipe_proposals` · 세류선 교차 + 간격 보충 ·
+ * 있는 관 · 지운 관 상태) · 화면은 목록 + 배수유역도 점선 원 · 고른 것만 관 넣기 길(`addPipe`)로.
+ *
+ *   - 있는 관(라벨 짝 · 교차 5 m 안 관) = 목록에서 뺌(머리 글에 수만) · 지운 관 = 「지운 관」 표시 ·
+ *     고르면 다시 넣음(서버가 지움 표지 걷음).
+ *   - 아무것도 미리 안 고름 · [넣기] = 고른 것 · 세류선 교차 = 라벨 실음(노선 바뀐 [저장] 따라감 · 507-2).
+ *   - 노선 · 관이 바뀌면(배수유역 낡음) 목록 닫음 — 옛 노선 후보가 새 노선에 안 들어가게.
+ * ========================================================================== */
+
+import { API_BASE_URL } from "@config/config_frontend";
+import type { DetailPipeInput } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
+
+export interface PipeProposal {
+  chainage_m: number;
+  kind: "stream" | "spacing";
+  state: "new" | "held" | "dismissed";
+  stream_label?: DetailPipeInput["stream_label"];
+  stream_name?: string | null;
+}
+
+interface ProposalResponse {
+  proposals: PipeProposal[];
+  /** 간격 보충까지 셈(분석이 지금 노선) — 거짓 = 세류선 교차만. */
+  spacing: boolean;
+  message?: string;
+}
+
+/** 후보 한 줄 글. */
+export function proposalText(item: PipeProposal): string {
+  const at = `측점 ${Math.round(item.chainage_m)} m`;
+  const what =
+    item.kind === "stream"
+      ? `세류선 교차${item.stream_name ? `(${item.stream_name})` : ""}`
+      : "간격 보충(흐름이 모이는 자리)";
+  return `${at} — ${what}${item.state === "dismissed" ? " · 지운 관" : ""}`;
+}
+
+export interface DrainagePropose {
+  root: HTMLElement;
+  /** 서버에 후보를 물어 목록을 엶. */
+  open(): Promise<void>;
+  close(): void;
+  /** 목록에 오른 후보 누가거리 — 배수유역도 점선 원. */
+  candidates(): number[];
+}
+
+export function createDrainagePropose(deps: {
+  projectId: () => string | null;
+  pipeRequest: () => DetailPipeInput[];
+  /** 고른 후보를 관 넣기 길로(패널 `addPipe` 와 같은 길). */
+  addPipes: (picks: PipeProposal[]) => void;
+  redraw: () => void;
+}): DrainagePropose {
+  const root = document.createElement("div");
+  root.className = "b05-drainage__suggest b05-drainage__proposals";
+  root.hidden = true;
+  const head = document.createElement("div");
+  head.className = "b05-drainage__suggest-head";
+  const title = document.createElement("span");
+  const add = document.createElement("button");
+  add.type = "button";
+  add.className = "b05-drainage__analyze";
+  add.textContent = "넣기";
+  add.title = "고른 후보만 관으로 넣습니다 — 초안이라 [저장] 때 남습니다.";
+  const shut = document.createElement("button");
+  shut.type = "button";
+  shut.className = "b05-drainage__analyze";
+  shut.textContent = "닫기";
+  head.append(title, add, shut);
+  const list = document.createElement("ul");
+  list.className = "b05-drainage__suggest-list b05-drainage__proposals-list";
+  root.append(head, list);
+  let shown: PipeProposal[] = [];
+  const picked = new Set<number>();
+  let sequence = 0;
+
+  const close = (): void => {
+    sequence += 1;
+    root.hidden = true;
+    shown = [];
+    picked.clear();
+    list.replaceChildren();
+    deps.redraw();
+  };
+
+  const render = (response: ProposalResponse): void => {
+    shown = response.proposals.filter((item) => item.state !== "held");
+    const held = response.proposals.length - shown.length;
+    title.textContent =
+      `자동 제안 ${shown.length}건` +
+      (held ? ` · 있는 관 ${held} 뺌` : "") +
+      (response.spacing ? "" : " · 배수유역 낡음 — 세류선 교차만");
+    list.replaceChildren(
+      ...shown.map((item, index) => {
+        const row = document.createElement("li");
+        const label = document.createElement("label");
+        const box = document.createElement("input");
+        box.type = "checkbox";
+        box.addEventListener("change", () => {
+          if (box.checked) picked.add(index);
+          else picked.delete(index);
+          add.disabled = picked.size === 0;
+        });
+        label.append(box, ` ${proposalText(item)}`);
+        row.append(label);
+        return row;
+      }),
+    );
+    add.disabled = true;
+    root.hidden = false;
+    deps.redraw();
+  };
+
+  add.addEventListener("click", () => {
+    const picks = shown.filter((_, index) => picked.has(index));
+    close();
+    if (picks.length) deps.addPipes(picks);
+  });
+  shut.addEventListener("click", close);
+
+  return {
+    root,
+    async open() {
+      const projectId = deps.projectId();
+      if (!projectId) return;
+      const sent = ++sequence;
+      title.textContent = "자동 제안 — 후보 셈 중";
+      root.hidden = false;
+      list.replaceChildren();
+      add.disabled = true;
+      try {
+        const response = await fetch(
+          `${API_BASE_URL}/projects/${projectId}/drainage/pipe-proposals`,
+          {
+            method: "POST",
+            credentials: "include",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({ points: deps.pipeRequest() }),
+          },
+        );
+        const payload = (await response.json()) as ProposalResponse;
+        if (sent !== sequence) return;
+        if (!response.ok) throw new Error(payload.message ?? `HTTP ${response.status}`);
+        render(payload);
+      } catch (error) {
+        if (sent !== sequence) return;
+        title.textContent = `자동 제안 실패 — ${error instanceof Error ? error.message : error}`;
+      }
+    },
+    close,
+    candidates: () => (root.hidden ? [] : shown.map((item) => item.chainage_m)),
+  };
+}
diff --git a/B05_Profile/B05_Profile_UI_Style_Drainage.css b/B05_Profile/B05_Profile_UI_Style_Drainage.css
index 2ca878278..a3f553295 100644
--- a/B05_Profile/B05_Profile_UI_Style_Drainage.css
+++ b/B05_Profile/B05_Profile_UI_Style_Drainage.css
@@ -334,3 +334,18 @@
   padding-left: 1.2em;
   overflow-y: auto;
 }
+
+/* [자동 제안] 후보 목록(510) — 고름 칸 · 목록 위 [넣기] · [닫기]. */
+.b05-drainage__proposals-list {
+  max-height: 9em;
+  padding-left: 0;
+  list-style: none;
+}
+
+.b05-drainage__proposals .b05-drainage__suggest-head {
+  gap: var(--spacing-8);
+}
+
+.b05-drainage__proposals .b05-drainage__suggest-head > span {
+  flex: 1 1 auto;
+}
diff --git a/common_util/common_util_drainage_pipes.py b/common_util/common_util_drainage_pipes.py
index 0895ce5bf..b31b98b98 100644
--- a/common_util/common_util_drainage_pipes.py
+++ b/common_util/common_util_drainage_pipes.py
@@ -500,6 +500,7 @@ def carry_facility_attributes(base: list[PipePoint], reference: list[PipePoint])
         point.summary_item = ref.summary_item
         point.group_items = ref.group_items
         point.id = ref.id
+        point.stream_label = ref.stream_label  # 화면이 실어 온 라벨(510 · 없으면 저장 때 id 로)
         # 땅 위 자리도 — 버리면 저장이 노선 위 측점 자리로 채워 정본 좌표를 덮음(493-4)
         point.x, point.y = ref.x, ref.y
     return ensure_pipe_ids(base)
diff --git a/common_util/common_util_stream_crossing.py b/common_util/common_util_stream_crossing.py
index 0b194c40e..150cdab77 100644
--- a/common_util/common_util_stream_crossing.py
+++ b/common_util/common_util_stream_crossing.py
@@ -119,8 +119,8 @@ def _gap(label: dict[str, Any], x: float, y: float) -> float:
     return math.hypot(float(label["x"]) - x, float(label["y"]) - y)
 
 
-def claim_crossings(labels: Sequence[dict[str, Any]], crossings: Sequence[Any]) -> set[int]:
-    """라벨마다 같은 세류선 교차점 중 라벨 좌표와 가장 가까운 것 하나 — 잡힌 교차점 번호.
+def claim_crossings(labels: Sequence[dict[str, Any]], crossings: Sequence[Any]) -> dict[int, int]:
+    """라벨마다 같은 세류선 교차점 중 라벨 좌표와 가장 가까운 것 하나 — {교차점 번호: 라벨 번호}.
 
     가까운 짝부터 하나씩(라벨 하나 · 교차점 하나) · 거리 한계 없음.
     """
@@ -132,12 +132,12 @@ def claim_crossings(labels: Sequence[dict[str, Any]], crossings: Sequence[Any])
         if getattr(crossing, "stream_id", None) == label["stream"]
     )
     used_labels: set[int] = set()
-    used: set[int] = set()
+    used: dict[int, int] = {}
     for _, li, ci in pairs:
         if li in used_labels or ci in used:
             continue
         used_labels.add(li)
-        used.add(ci)
+        used[ci] = li
     return used
 
 
@@ -220,3 +220,62 @@ def keep_labels(
             continue
         if mark not in dismissed:
             dismissed.append(mark)
+    # 지운 자동 관을 [자동 제안]으로 다시 넣음(510) — 그 지움 표지는 걷음
+    held = [point.stream_label for point in points if point.stream_label]
+    dismissed[:] = [mark for mark in dismissed if mark not in held]
+
+
+def propose_pipes(
+    vertices: Sequence[RouteVertex],
+    crossings: Sequence[Any],
+    pipes: Sequence[Any],
+    dismissed: Sequence[dict[str, Any]],
+    strength_curve: Any = None,
+) -> list[dict[str, Any]]:
+    """[자동 제안] 후보(510) — 세류선 교차(`_base_pipes` · 라벨) + 간격 보충(흐름 세기 · 분석이
+    지금 노선일 때) · 관 목록엔 안 넣음(사용자가 골라 관 넣기 길로).
+
+    상태 = held(라벨 짝 관 · 교차 5 m 안 관) · dismissed(지움 표지 짝 · 라벨 = 그 표지) · new.
+    짝 잡기 = 노선 [저장](`add_crossing_pipes`)과 같은 `claim_crossings`(관 라벨 + 지움 표지 함께).
+    간격 보충 = 지금 관 + 새 교차 후보 사이가 최대 간격을 넘는 구간(`suggest_pipe_positions`).
+    """
+    from common_util.common_util_drainage_detail import suggest_pipe_positions
+    from common_util.common_util_route_geometry import interpolate_vertex
+    from common_util.common_util_structure_station import snap_structure_station
+
+    total = float(vertices[-1].chainage_m)
+    held = [pipe.stream_label for pipe in pipes if pipe.stream_label]
+    marks = [mark for mark in dismissed if "stream" in mark]
+    claimed = claim_crossings([*held, *marks], crossings)
+    labels = crossing_labels(crossings)
+    taken = [float(pipe.chainage_m) for pipe in pipes]
+    found: list[dict[str, Any]] = []
+    for index, crossing in enumerate(crossings):
+        at = snap_structure_station(float(crossing.chainage_m), [total])
+        label, state = labels[index], "new"
+        if index in claimed:
+            pick = claimed[index]
+            state = "held" if pick < len(held) else "dismissed"
+            if state == "dismissed":
+                label = marks[pick - len(held)]
+        elif any(abs(other - at) < DRAINAGE_PIPE_MIN_SPACING_M for other in taken):
+            state = "held"
+        found.append(
+            {
+                "chainage_m": at,
+                "kind": "stream",
+                "state": state,
+                "stream_label": dict(label),
+                "stream_name": getattr(crossing, "stream_name", None),
+            }
+        )
+    if strength_curve is not None:
+        base = sorted({*taken, *(item["chainage_m"] for item in found if item["state"] == "new")})
+        placed = [
+            StructureCandidate(chainage_m=c, x=xy[0], y=xy[1], reason="confirmed")
+            for c in base
+            for xy in [interpolate_vertex(list(vertices), c)]
+        ]
+        for pipe in suggest_pipe_positions(list(vertices), placed, strength_curve):
+            found.append({"chainage_m": float(pipe.chainage_m), "kind": "spacing", "state": "new"})
+    return sorted(found, key=lambda item: item["chainage_m"])
diff --git a/resources/tester/helper_349_drainage_live_flow.cjs b/resources/tester/helper_349_drainage_live_flow.cjs
index 9946d7eaa..9e0306e01 100644
--- a/resources/tester/helper_349_drainage_live_flow.cjs
+++ b/resources/tester/helper_349_drainage_live_flow.cjs
@@ -325,7 +325,7 @@ async function main() {
   savedAnswer({ basins: [], pipe_points: pipes, stale: "배수유역 낡음" });
   await flush();
   out.undoSavedStale = { ...look(), savedLoads, mode: state.get("drainage-mode") };
-  // 369 [자동 제안] — 낡은 동안 끔 · ① all · ② add · [배관 배치 초기화] = 관 목록 없이(세류선만)
+  // [자동 제안] — 낡은 동안 끔 · 누름은 패널 후보 목록(510 · 여기 안 셈) · [배관 배치 초기화] = 관 목록 없이(세류선만)
   out.proposeStale = { off: propose.disabled, title: propose.title };
   const beforeStale = detailCalls.length;
   propose.fire("click");
@@ -336,10 +336,6 @@ async function main() {
   const n0 = detailCalls.length;
   const remembered0 = remembered;
   const records0 = records;
-  modeRow = 0;
-  propose.fire("click");
-  await flush();
-  modeRow = 1;
   propose.fire("click");
   await flush();
   live.resetToStreams();
@@ -352,14 +348,13 @@ async function main() {
   };
   // 화면이 몰랐던 낡음 — 빠른 길이 409 낡음이면 곧바로 지금 노선으로 셈 길로 다시
   detailStale = true;
-  modeRow = 0;
   const fallbackFrom = calls.length;
-  propose.fire("click");
+  live.resetToStreams();
   await flush();
   const fallbackCall = calls[calls.length - 1];
   out.proposeFallback = {
     sent: calls.length - fallbackFrom,
-    auto: fallbackCall.body.auto,
+    points: fallbackCall.body.points,
     status: status.textContent,
   };
   answer(fallbackCall);
@@ -371,18 +366,11 @@ async function main() {
   answer(calls[calls.length - 1]);
   await flush();
   const viaDetail = detailCalls.length;
-  modeRow = 0;
-  propose.fire("click");
-  const liveCall = calls[calls.length - 1];
-  answer(liveCall);
-  await flush();
   live.resetToStreams();
   const resetCall = calls[calls.length - 1];
   answer(resetCall);
   await flush();
   out.proposeLive = {
-    auto: liveCall.body.auto,
-    points: liveCall.body.points.length,
     resetPoints: resetCall.body.points,
     resetAuto: resetCall.body.auto ?? null,
     detailCalls: detailCalls.length - viaDetail,
diff --git a/resources/tester/helper_510_propose.cjs b/resources/tester/helper_510_propose.cjs
new file mode 100644
index 000000000..6f0676ebf
--- /dev/null
+++ b/resources/tester/helper_510_propose.cjs
@@ -0,0 +1,98 @@
+/* 510-1 [자동 제안] 후보 목록 — 진짜 `B05_Profile_UI_Drainage_Propose.ts` · 관 속성 보관소를 가짜 DOM · fetch 로.
+ * node helper_510_propose.cjs  (짝 = `test_510_auto_pipe_propose.py`) */
+const path = require("path");
+const { makeLoader } = require("./helper_ts_stub_loader.cjs");
+
+const ROOT = path.join(__dirname, "..", "..");
+
+/* ---- 가짜 DOM(쓰는 것만) ---- */
+function el(tag) {
+  const listeners = {};
+  const node = {
+    tag,
+    children: [],
+    hidden: false,
+    disabled: false,
+    checked: false,
+    textContent: "",
+    append(...items) {
+      items.forEach((item) =>
+        node.children.push(typeof item === "string" ? { text: item } : item),
+      );
+    },
+    replaceChildren(...items) {
+      node.children = [];
+      node.append(...items);
+    },
+    addEventListener(type, fn) {
+      (listeners[type] ??= []).push(fn);
+    },
+    fire(type) {
+      (listeners[type] ?? []).forEach((fn) => fn());
+    },
+  };
+  return node;
+}
+globalThis.document = { createElement: el };
+
+const sent = [];
+globalThis.fetch = async (url, init) => {
+  sent.push({ url, body: JSON.parse(init.body) });
+  return {
+    ok: true,
+    json: async () => ({
+      spacing: true,
+      proposals: [
+        { chainage_m: 50, kind: "stream", state: "dismissed", stream_label: { stream: "S1", order: 1 } },
+        { chainage_m: 150, kind: "stream", state: "held", stream_label: { stream: "S2", order: 1 } },
+        {
+          chainage_m: 320,
+          kind: "stream",
+          state: "new",
+          stream_label: { stream: "S4", order: 1 },
+          stream_name: "작은골",
+        },
+        { chainage_m: 420, kind: "spacing", state: "new" },
+      ],
+    }),
+  };
+};
+
+const { load } = makeLoader({ root: ROOT });
+const { createDrainagePropose } = load("B05_Profile", "B05_Profile_UI_Drainage_Propose.ts");
+const { createFacilityStore } = load("B05_Profile", "B05_Profile_UI_Drainage_Facility.ts");
+
+(async () => {
+  const added = [];
+  const propose = createDrainagePropose({
+    projectId: () => "p1",
+    pipeRequest: () => [{ chainage_m: 150, source: "user" }],
+    addPipes: (picks) =>
+      picks.forEach((item) => added.push([item.chainage_m, item.stream_label?.stream ?? null])),
+    redraw: () => undefined,
+  });
+  await propose.open();
+  const [head, list] = propose.root.children;
+  const [title, add] = head.children;
+  const boxes = list.children.map((row) => row.children[0].children[0]);
+  const out = {
+    sent: { url: sent[0].url, points: sent[0].body.points.length },
+    rows: list.children.map((row) => row.children[0].children[1].text.trim()),
+    title: title.textContent,
+    addOff: add.disabled,
+    candidates: propose.candidates(),
+  };
+  boxes[1].checked = true;
+  boxes[1].fire("change");
+  boxes[2].checked = true;
+  boxes[2].fire("change");
+  add.fire("click");
+  out.added = added;
+  out.afterClose = { hidden: propose.root.hidden, candidates: propose.candidates() };
+
+  // 관 속성 보관소 — 응답 라벨이 다음 요청에 실림(라벨만 있는 맨 배관도 보관)
+  const store = createFacilityStore();
+  store.replaceFromResponse([{ chainage_m: 320, stream_label: { stream: "S4", order: 1 } }]);
+  out.carried = store.attach([{ chainage_m: 320, source: "user" }])[0].stream_label ?? null;
+  console.log(JSON.stringify(out));
+})();
diff --git a/resources/tester/test_349_drainage_live_flow.py b/resources/tester/test_349_drainage_live_flow.py
index 16ccc91f3..13bbc5bb1 100644
--- a/resources/tester/test_349_drainage_live_flow.py
+++ b/resources/tester/test_349_drainage_live_flow.py
@@ -75,24 +75,23 @@ def test_자동_제안_두_방식_초기화_세류선만_한_걸음(r):
         "calls": 0,  # 낡은 동안 끔 — 눌러도 요청 없음
     }
     assert r["proposeFresh"] == {"off": False, "title": "B05_Drainage_Btn_Propose_Tip"}
+    # [자동 제안] 누름 = 패널 후보 목록(510 · test_510) — 여기선 초기화만 초안
     assert r["propose"] == {
-        "autos": ["all", "add", None],
-        "points": [1, 1, None],  # ① ② = 지금 관 목록 함께 · 초기화 = 목록 없이(세류선만)
-        "remembered": 3,  # 셋 다 초안
-        "records": 3,  # 답마다 사진첩 한 걸음
+        "autos": [None],
+        "points": [None],  # 초기화 = 목록 없이(세류선만)
+        "remembered": 1,
+        "records": 1,  # 답마다 사진첩 한 걸음
     }
     # 저장 분석이 옛 노선 — 지금 노선으로 셈 길(detail-basins 안 부름) · 같은 초안 · 한 걸음
     assert r["proposeLive"] == {
-        "auto": "all",
-        "points": 1,
         "resetPoints": None,
         "resetAuto": None,
         "detailCalls": 0,
-        "remembered": 6,  # 앞 「409 → 다시」 한 번 포함
-        "records": 6,
+        "remembered": 3,  # 앞 「409 → 다시」 한 번 포함
+        "records": 3,
     }
     fallback = r["proposeFallback"]
-    assert fallback["sent"] == 1 and fallback["auto"] == "all"
+    assert fallback["sent"] == 1 and fallback["points"] is None
     assert "낡음" not in fallback["status"]  # 409 글을 오류로 안 띄움(조용히 다시)
 
 
diff --git a/resources/tester/test_510_auto_pipe_propose.py b/resources/tester/test_510_auto_pipe_propose.py
new file mode 100644
index 000000000..6169e971a
--- /dev/null
+++ b/resources/tester/test_510_auto_pipe_propose.py
@@ -0,0 +1,157 @@
+# -*- coding: utf-8 -*-
+"""510-1 [자동 제안] = B05 배수유역 영역 후보 → 사용자가 골라 넣음(요구 320-2).
+
+못박는 것
+  - 후보 = 지금 노선 × 세류선 교차(5 m 솎기 · 정수 m · 라벨) + 간격 보충(흐름 세기 · 분석 있을 때만).
+  - 상태 = 라벨 짝 관 · 교차 5 m 안 관 = held · 지움 표지 짝 = dismissed(라벨 = 그 표지) · 나머지 new.
+  - 고른 교차 후보 = 라벨 실은 관 → 계산 왕복(carry) · 저장(keep_labels) 지나도 라벨 · 지운 관을 다시
+    넣으면 지움 표지 걷음.
+  - 넣은 라벨 관 = 노선 바뀐 [저장] 따라감 · 새 관 안 더함(겹침 없음).
+  - 화면: 아무것도 미리 안 고름 · [넣기] = 고른 것만 · held 는 목록 밖 · 관 속성 보관소가 라벨 왕복.
+"""
+
+from __future__ import annotations
+
+import json
+import shutil
+import subprocess
+import sys
+from pathlib import Path
+
+import numpy as np
+import pytest
+
+ROOT = Path(__file__).resolve().parents[2]
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))
+
+import B05_Profile.B05_Profile_Route_Save as save  # noqa: E402
+from B04_PreProcess.B04_PreProcess_Engine_Watershed_Analyze import _base_pipes  # noqa: E402
+from B05_Profile.B05_Profile_Route_Save_Parts import vertices_of  # noqa: E402
+from common_util.common_util_drainage_pipes import (  # noqa: E402
+    PipePoint,
+    carry_facility_attributes,
+    parse_pipe_points,
+)
+from common_util.common_util_stream_crossing import keep_labels, propose_pipes  # noqa: E402
+
+HERE = Path(__file__).resolve().parent
+TSC = ROOT / "config" / "node_modules" / "typescript"
+
+
+def _stream(ufid: str, x: float) -> dict:
+    return {
+        "type": "Feature",
+        "properties": {"UFID": ufid},
+        "geometry": {"type": "LineString", "coordinates": [[x, -50.0], [x, 120.0]]},
+    }
+
+
+LINE = [[0.0, 0.0], [300.0, 0.0], [600.0, 0.0]]
+STREAMS = [_stream("S1", 50.4), _stream("S2", 150.0), _stream("S3", 250.0), _stream("S4", 320.0)]
+
+
+def _case():
+    vertices = vertices_of(LINE)
+    crossings = _base_pipes(vertices, STREAMS)
+    s2 = {"stream": "S2", "order": 1, "x": 150.0, "y": 0.0}
+    pipes = [
+        PipePoint(chainage_m=150.0, source="user", stream_label=s2, id="p15000"),
+        PipePoint(chainage_m=252.0, source="user", id="p25200"),  # 라벨 없음 · S3 교차 5 m 안
+    ]
+    dismissed = [{"stream": "S1", "order": 1, "x": 50.4, "y": 0.0}]
+    return vertices, crossings, pipes, dismissed
+
+
+def test_후보_교차_상태_라벨():
+    vertices, crossings, pipes, dismissed = _case()
+    found = propose_pipes(vertices, crossings, pipes, dismissed)
+    assert [(f["chainage_m"], f["kind"], f["state"]) for f in found] == [
+        (50.0, "stream", "dismissed"),  # 정수 m
+        (150.0, "stream", "held"),
+        (250.0, "stream", "held"),
+        (320.0, "stream", "new"),
+    ]
+    assert found[0]["stream_label"] == dismissed[0]  # 지운 관 = 그 표지 그대로(다시 넣으면 걷음)
+    assert found[3]["stream_label"] == {"stream": "S4", "order": 1, "x": 320.0, "y": 0.0}
+
+
+def test_간격_보충_분석_있을_때만():
+    vertices, crossings, pipes, dismissed = _case()
+    curve = np.ones(601)
+    found = propose_pipes(vertices, crossings, pipes, dismissed, curve)
+    spacing = [f for f in found if f["kind"] == "spacing"]
+    assert spacing and all(f["state"] == "new" and "stream_label" not in f for f in spacing)
+    # 지금 관 + 새 교차 후보 사이 최대 간격(100 m) 넘는 구간만 · 320 뒤 280 m
+    taken = [150.0, 252.0, 320.0]
+    assert all(min(abs(f["chainage_m"] - t) for t in taken) > 0.5 for f in spacing)
+    assert any(f["chainage_m"] > 320.0 for f in spacing)
+    assert not [f for f in propose_pipes(vertices, crossings, pipes, dismissed) if f["kind"] == "spacing"]
+
+
+def test_고른_라벨_관_계산_왕복_저장_지나도_라벨():
+    label = {"stream": "S4", "order": 1, "x": 320.0, "y": 0.0}
+    request = parse_pipe_points([{"chainage_m": 320.0, "source": "user", "stream_label": label}])
+    rebuilt = carry_facility_attributes([PipePoint(chainage_m=320.0, source="user")], request)
+    assert rebuilt[0].stream_label == label  # 고치기 전 = 계산 왕복에서 사라짐
+    dismissed: list = []
+    keep_labels(rebuilt, [], dismissed)
+    assert rebuilt[0].stream_label == label and dismissed == []
+
+
+def test_지운_관_다시_넣으면_지움_표지_걷음():
+    mark = {"stream": "S1", "order": 1, "x": 50.4, "y": 0.0}
+    other = {"stream": "S9", "order": 1, "x": 9.0, "y": 0.0}
+    dismissed = [mark, other]
+    keep_labels([PipePoint(chainage_m=50.0, stream_label=dict(mark))], [], dismissed)
+    assert dismissed == [other]
+
+
+# 507-2 시험과 같은 꼴 — 앞 노선을 북으로 옮겨 세류선 교차가 30 m 옮음
+OLD = [[0.0, 0.0], [100.0, 0.0], [200.0, 0.0], [300.0, 0.0], [400.0, 0.0]]
+NEW1 = [[0.0, 0.0], [100.0, 0.0], [200.0, 60.0], [300.0, 0.0], [400.0, 0.0]]
+NEW2 = [[0.0, 0.0], [100.0, 0.0], [200.0, 90.0], [300.0, 0.0], [400.0, 0.0]]
+ONE = [_stream("S1", 150.0)]
+
+
+def _follow(old, old_xy, new_xy):
+    points = [{"x": x, "y": y} for x, y in new_xy]
+    pairs, crossing, _ = save.followed_pipes(old, old_xy, points, ONE, [])
+    return [pipe for _, pipe in pairs], crossing
+
+
+def test_넣은_라벨_관_노선_바꿈_따라감_겹침_없음():
+    [cand] = propose_pipes(vertices_of(OLD), _base_pipes(vertices_of(OLD), ONE), [], [])
+    assert cand["state"] == "new"
+    picked = PipePoint(
+        chainage_m=cand["chainage_m"], source="user", x=150.0, y=0.0,
+        stream_label=cand["stream_label"], id="p15000",
+    )  # fmt: skip
+    pipes, crossing = _follow([picked], OLD, NEW1)
+    assert crossing == 0 and len(pipes) == 1 and pipes[0].stream_label == cand["stream_label"]
+    again = parse_pipe_points([pipe.as_dict() for pipe in pipes])
+    pipes2, crossing2 = _follow(again, NEW1, NEW2)
+    assert crossing2 == 0 and len(pipes2) == 1
+    # 새 노선에서 다시 물으면 = 있는 관(held) · 후보 아님
+    [again_cand] = propose_pipes(vertices_of(NEW2), _base_pipes(vertices_of(NEW2), ONE), pipes2, [])
+    assert again_cand["state"] == "held"
+
+
+@pytest.mark.skipif(shutil.which("node") is None or not TSC.is_dir(), reason="node · typescript 없음")
+def test_화면_고른_것만_넣음_라벨_왕복():
+    run = subprocess.run(
+        ["node", str(HERE / "helper_510_propose.cjs")],
+        capture_output=True, text=True, encoding="utf-8", timeout=60, check=True,
+    )  # fmt: skip
+    got = json.loads(run.stdout)
+    assert got["sent"] == {"url": "http://fake/projects/p1/drainage/pipe-proposals", "points": 1}
+    assert got["rows"] == [
+        "측점 50 m — 세류선 교차 · 지운 관",
+        "측점 320 m — 세류선 교차(작은골)",
+        "측점 420 m — 간격 보충(흐름이 모이는 자리)",
+    ]  # held 는 목록 밖
+    assert got["title"] == "자동 제안 3건 · 있는 관 1 뺌"
+    assert got["addOff"] is True and got["candidates"] == [50, 320, 420]
+    assert got["added"] == [[320, "S4"], [420, None]]  # 고른 둘만
+    assert got["afterClose"] == {"hidden": True, "candidates": []}
+    assert got["carried"] == {"stream": "S4", "order": 1}  # 응답 → 보관소 → 요청
diff --git a/ui_template/ui_template_locale_b2.ts b/ui_template/ui_template_locale_b2.ts
index 42187a7d1..499da23d1 100644
--- a/ui_template/ui_template_locale_b2.ts
+++ b/ui_template/ui_template_locale_b2.ts
@@ -1005,24 +1005,13 @@ export const ui_locales_b2 = {
   B06_Std_Note_Paved: ["포장", "Paved"],
   B05_Drainage_Btn_Propose: ["자동 제안", "Auto suggest"],
   B05_Drainage_Btn_Propose_Tip: [
-    "관 자리를 프로그램이 정합니다(세류선 교차 + 최대 간격 보충) — 두 방식 중 고름. 초안이라 [저장] 때 남습니다.",
-    "Let the program place culverts (stream crossings + max spacing rule) — choose one of two ways. This is a draft — it is kept on [Save].",
+    "관 자리 후보를 셉니다(지금 노선 × 세류선 교차 + 최대 간격 보충) — 고른 것만 관으로 넣음. 초안이라 [저장] 때 남습니다.",
+    "Find culvert candidates (current route × stream crossings + max spacing rule) — only the ones you pick are added. This is a draft — it is kept on [Save].",
   ],
   B05_Drainage_Btn_Propose_Stale: [
     "노선 · 관 자리가 바뀌어 배수유역이 낡음 — [업데이트] 뒤 자동 제안",
     "Drainage basins are out of date — run [Update] first",
   ],
-  B05_Drainage_Propose_Title: ["관 자리 자동 제안", "Auto-suggest culvert positions"],
-  B05_Drainage_Propose_All: ["전체 자동", "Fully automatic"],
-  B05_Drainage_Propose_All_Hint: [
-    "세류선 교차 + 최대 간격 규칙으로 관 자리를 새로 정함(같은 자리 관은 시설 · 관경 유지)",
-    "Re-place every culvert by stream crossings + max spacing (culverts at the same spot keep their facility and size)",
-  ],
-  B05_Drainage_Propose_Add: ["지정 포함 추가", "Add to my culverts"],
-  B05_Drainage_Propose_Add_Hint: [
-    "지금 관은 그대로 두고 간격이 먼 구간에만 관을 더함",
-    "Keep the current culverts and add culverts only where the spacing is too long",
-  ],
   Design_Pipeline_Unstable: [
     "계산 불안정 — 입력과 결과가 세 바퀴 안에 안 맞음",
     "Calculation unstable — inputs and results did not settle in three rounds",