diff --git a/B06_Section/B06_Section_UI_Cross_Design_Pick.ts b/B06_Section/B06_Section_UI_Cross_Design_Pick.ts
index 1a5cf4395..9ea0e2d1b 100644
--- a/B06_Section/B06_Section_UI_Cross_Design_Pick.ts
+++ b/B06_Section/B06_Section_UI_Cross_Design_Pick.ts
@@ -37,7 +37,7 @@ import {
   type LineCellState,
   type RockCellSpec,
 } from "./B06_Section_UI_Cross_Line_Cell";
-import { extendStop, toePoints } from "./logic/B06_Section_UI_Cross_Fit";
+import { edgeOnGround, extendStop, toePoints } from "./logic/B06_Section_UI_Cross_Fit";
 
 const SVG_NS = "http://www.w3.org/2000/svg";
 const DESIGN_CLASS = "b06-chart__design-cross";
@@ -379,6 +379,7 @@ export function designLineMoves(
   berm?: BermDepthControl;
   center?: number;
   toes?: ReturnType<typeof toePoints>;
+  bare?: ReturnType<typeof edgeOnGround>;
   rock?: RockCellSpec;
 } {
   const design = section.design;
@@ -400,6 +401,7 @@ export function designLineMoves(
       stopAt: (side, now, next) => extendStop(section.samples, design.road_edges, side, now, next),
     },
     toes: toePoints(section), // 교차점 손잡이(370-2)
+    bare: edgeOnGround(section.samples, design.road_edges), // 절·성토 없는 쪽(379-1)
     berm: {
       set: (side, valueM) => send({ berm_depth: { side, valueM } }),
       // 끔은 이 측점이 켠 때만 — 다른 카드 소단을 고르며 옛 카드가 풀릴 때 새 켬을 안 지움
@@ -438,6 +440,8 @@ export function attachDesignLinePick(input: {
   center?: number;
   /** 있으면 쪽마다 교차점 손잡이(설계선 ∩ 원지반 · 키 `toe:left|right` · 늘 보임 · 370-2). */
   toes?: ReturnType<typeof toePoints>;
+  /** 있으면 쪽마다 노견 끝 = 원지반(절·성토 없음 · 379-1) — 손잡이 값 앞 알림. */
+  bare?: ReturnType<typeof edgeOnGround>;
   /** 있으면 암 경계선 고름(키 `rock` · ▲▼↺ · 세로 끌기) · 안 고른 때 공용 칸 = 암(370-3). */
   rock?: RockCellSpec;
 }): DesignLinePick {
@@ -500,7 +504,6 @@ export function attachDesignLinePick(input: {
     const toe = input.toes?.[at] as { offset_m: number; elevation_m: number };
     const hit = centerHit(x(toe.offset_m), toDisplayY(toe.elevation_m));
     hit.classList.add(TOE_CLASS);
-    hit.setAttribute("r", "5");
     hits.push(hit);
   }
   // 암 경계선(370-3) — 점선(`appendRockBoundaryOverlay`) 위 판정 선 하나(끊긴 토막도 한 path) · 키 rock
@@ -631,6 +634,7 @@ export function attachDesignLinePick(input: {
       const moved = extend > 0 ? ` · 이동 +${extendText(extend)}m` : "";
       const toe = toeSide ? input.toes?.[toeSide] : null;
       const dims = piece ? pieceLabel(design, piece).replace("\n", " · ") : "";
+      const bare = toeSide && input.bare?.[toeSide] ? "절·성토 없음 · " : ""; // 379-1
       // 아래 띠 공용 칸(370-3) — 안 고르면 암(암 지반만) · 고르면 그 선 제목 · 버튼 · 값 한 줄
       const state: LineCellState | null =
         onRock || (!chosen && rock)
@@ -639,8 +643,8 @@ export function attachDesignLinePick(input: {
             ? { title: "중심점", value: centerPreviewText(0), buttons: sideways(false) }
             : toe
               ? {
-                  title: `교차점 이동 ${sideName}`,
-                  value: `노선에서 ${Math.abs(toe.offset_m).toFixed(2)}m${moved}`,
+                  title: `사면 이동 ${sideName}`,
+                  value: `${bare}노선에서 ${Math.abs(toe.offset_m).toFixed(2)}m${moved}`,
                   buttons: shift ? sideways(true) : {},
                 }
               : !piece
diff --git a/B06_Section/B06_Section_UI_Style_Cross_Areas.css b/B06_Section/B06_Section_UI_Style_Cross_Areas.css
index 0fe12440b..12c8a2a21 100644
--- a/B06_Section/B06_Section_UI_Style_Cross_Areas.css
+++ b/B06_Section/B06_Section_UI_Style_Cross_Areas.css
@@ -170,6 +170,8 @@
   cursor: pointer;
 }
 
+/* 마우스 올림 = 고른 모양(379-1) · 고름은 누를 때만 */
+.b06-chart__design-hit:hover,
 .b06-chart__design-hit.is-active {
   stroke: color-mix(in srgb, var(--color-royal-amethyst) 45%, transparent);
   stroke-width: 7;
@@ -193,21 +195,26 @@
   cursor: ew-resize;
 }
 
-/* 교차점 손잡이(370-2) — 사면 ∩ 원지반 작은 원 · 늘 보임 · 고르면 채움. */
+/* 교차점 손잡이(370-2) — 사면 ∩ 원지반 작은 원 · 늘 보임 · 고르면 채움 · 올리면 같은 모양(379-1). */
 .b06-chart__toe-hit {
   fill: var(--color-surface);
   stroke: var(--color-royal-amethyst);
   stroke-width: 1.5;
 }
 
+.b06-chart__toe-hit:hover,
 .b06-chart__toe-hit.is-active {
   fill: var(--color-royal-amethyst);
   cursor: pointer;
 }
 
 /* 암 경계선 고름(370-3) — 점선 위 투명 판정 선 · 고르면 경고색 띠 · 세로 끌기. */
+.b06-chart__design-hit.b06-chart__rock-hit:hover,
 .b06-chart__design-hit.b06-chart__rock-hit.is-active {
   stroke: color-mix(in srgb, var(--color-warning) 40%, transparent);
+}
+
+.b06-chart__design-hit.b06-chart__rock-hit.is-active {
   cursor: ns-resize;
 }
 
diff --git a/B06_Section/logic/B06_Section_UI_Cross_Fit.ts b/B06_Section/logic/B06_Section_UI_Cross_Fit.ts
index 0b4250e69..d30b011af 100644
--- a/B06_Section/logic/B06_Section_UI_Cross_Fit.ts
+++ b/B06_Section/logic/B06_Section_UI_Cross_Fit.ts
@@ -112,6 +112,19 @@ export function extendStop(
   return next;
 }
 
+/** 절·성토 없는 쪽(379-1) — 노견 끝 = 원지반(±5 mm · 멈춤 반올림 0.001 m 를 덮음). 지반 모르면 false. */
+export function edgeOnGround(
+  samples: CrossSection["samples"],
+  edges: CrossDesign["road_edges"] | undefined,
+): Record<"left" | "right", boolean> {
+  const groundAt = groundInterpolator(samples ?? []);
+  const on = (side: "left" | "right") =>
+    !!groundAt &&
+    !!edges &&
+    Math.abs(groundAt(edges[side].offset_m) - edges[side].elevation_m) <= 0.005;
+  return { left: on("left"), right: on("right") };
+}
+
 /**
  * 성토측 사면의 **본래** 경사길이(m) — 성토가 아닌 측은 null (2026-09-03 사용자 지시).
  *
diff --git a/resources/tester/helper_370_2_toe_stop.cjs b/resources/tester/helper_370_2_toe_stop.cjs
index 3d64dda20..c62046e96 100644
--- a/resources/tester/helper_370_2_toe_stop.cjs
+++ b/resources/tester/helper_370_2_toe_stop.cjs
@@ -107,11 +107,12 @@ class FakeNode {
     (this.listeners.click ?? []).forEach((fn) => fn(event));
   }
 }
+const docKeys = new Set(); // 방향키 듣개(379-1 · 정확히 0 자리)
 globalThis.document = {
   createElement: (tag) => new FakeNode(tag),
   createElementNS: (_ns, tag) => new FakeNode(tag),
-  addEventListener: () => {},
-  removeEventListener: () => {},
+  addEventListener: (type, fn) => type === "keydown" && docKeys.add(fn),
+  removeEventListener: (type, fn) => type === "keydown" && docKeys.delete(fn),
 };
 globalThis.window = { setTimeout, clearTimeout, addEventListener: () => {} };
 
@@ -302,4 +303,36 @@ out.inherit = {
 after.handle.setActive(afterIndex);
 out.inherit.label = cellOf(after.handle).title;
 
+// ④ 정확히 0 자리(379-1) — 노견 끝 = 원지반(±5 mm = 절·성토 없음) · 손잡이 · 누르면 사면처럼 ◀↺▶ · 방향키
+// 조각 0 은 안 봄 — 그림 규칙(노견 끝 → 첫 접점 보호 구간)이 지반 위 짧은 선을 남김(브레인 A)
+const zero = section(out.stop.value);
+const zeroPicks = [];
+const zeroLayer = new FakeNode("g");
+appendCrossDesignOverlay(zeroLayer, zero.design, x, y, zero.samples, undefined);
+zeroLayer.children.forEach((el) => el.setAttribute(pick.DESIGN_LINE_ATTR, ""));
+const zeroHandle = pick.attachDesignLinePick({
+  layer: zeroLayer,
+  design: zero.design,
+  x,
+  toDisplayY: y,
+  onPick: (i) => zeroPicks.push(i),
+  ...pick.designLineMoves(zero, () => undefined),
+});
+const zeroToes = zeroLayer.children.filter((k) => k.classList.contains("b06-chart__toe-hit"));
+const rightToe = zeroToes.find((t) => Number(t.getAttribute("cx")) > x(0));
+docKeys.clear();
+rightToe?.click();
+zeroHandle.setActive(zeroPicks[0]);
+const zeroCell = cellOf(zeroHandle);
+out.zero = {
+  bare: pick.designLineMoves(zero, () => undefined).bare,
+  nearBare: pick.designLineMoves(near, () => undefined).bare,
+  toe: !!rightToe,
+  radius: rightToe ? rightToe.getAttribute("r") : null,
+  title: zeroCell.title,
+  value: zeroCell.value,
+  buttons: ["left", "reset", "right"].filter((slot) => zeroCell.button(slot)),
+  keys: docKeys.size,
+};
+
 process.stdout.write(JSON.stringify(out));
diff --git a/resources/tester/test_370_2_toe_stop.py b/resources/tester/test_370_2_toe_stop.py
index e40accd7e..42e9f4e94 100644
--- a/resources/tester/test_370_2_toe_stop.py
+++ b/resources/tester/test_370_2_toe_stop.py
@@ -1,6 +1,6 @@
 """PLAN 370-2 — B06 사면 이동 멈춤 · 교차점 손잡이 · 고름 이어받기(요구 240-14).
 
-짝: `B06_Section/logic/B06_Section_UI_Cross_Fit.ts`(`extendStop` · `toePoints`) ·
+짝: `B06_Section/logic/B06_Section_UI_Cross_Fit.ts`(`extendStop` · `toePoints` · `edgeOnGround`) ·
 `B06_Section/B06_Section_UI_Cross_Design_Pick.ts`(손잡이 · 키 이어받기). 실제 TS 를
 `helper_370_2_toe_stop.cjs` 가 Node 로 돌린다.
 """
@@ -63,7 +63,7 @@ def test_교차점_손잡이_쪽마다_늘_보임(out) -> None:
 def test_손잡이를_고르면_그_쪽_사면_좌우_이동(out) -> None:
     got = out["toePick"]
     assert got["active"] is True and got["panelOpen"] is True
-    assert got["title"] == "교차점 이동 (우)"  # 아래 띠 공용 칸(370-3)
+    assert got["title"] == "사면 이동 (우)"  # 아래 띠 공용 칸(370-3)
     assert got["value"].startswith("노선에서 ")
     assert len(got["sent"]) == 1 and got["sent"][0]["side"] == "right"
     low, high = out["stop"]["crossing"]
@@ -76,4 +76,15 @@ def test_절에서_성으로_넘어가도_고름_유지(out) -> None:
     assert inherit["cutIndex"] >= 0 and inherit["before"] == inherit["cutIndex"]
     assert inherit["farMode"] == "left_cut"  # 우 = 성토로 넘어감
     assert inherit["afterIndex"] is not None
-    assert inherit["label"] == "교차점 이동 (우)"
+    assert inherit["label"] == "사면 이동 (우)"
+
+
+def test_정확히_0_자리는_절성토_없음_사면처럼_고름(out) -> None:
+    """379-1 — 멈춘 자리(노견 끝 = 원지반) 손잡이를 누르면 사면과 같은 조작."""
+    zero = out["zero"]
+    assert zero["bare"]["right"] is True and zero["nearBare"]["right"] is False
+    assert zero["toe"] is True and zero["radius"] == "8"  # 판정 원 8 px
+    assert zero["title"] == "사면 이동 (우)"
+    assert zero["value"].startswith("절·성토 없음 · 노선에서 ")
+    assert zero["buttons"] == ["left", "reset", "right"]  # ◀↺▶
+    assert zero["keys"] >= 1  # 방향키 듣개