diff --git a/B05_Profile/B05_Profile_Engine_RouteInitial.py b/B05_Profile/B05_Profile_Engine_RouteInitial.py
index 8c5cd017..44ac532e 100644
--- a/B05_Profile/B05_Profile_Engine_RouteInitial.py
+++ b/B05_Profile/B05_Profile_Engine_RouteInitial.py
@@ -27,6 +27,7 @@
 
 from __future__ import annotations
 
+import json
 import math
 from dataclasses import dataclass
 from pathlib import Path
@@ -133,6 +134,31 @@ def load_terrain_and_streams(
     return Terrain(np.asarray(x), np.asarray(y), np.asarray(z), np.asarray(valid)), streams
 
 
+def _choice_path(project_root: Path) -> Path:
+    return project_root / "B05_Profile" / "route" / "initial_choice.json"
+
+
+def read_initial_choice(project_root: Path) -> dict[str, Any]:
+    """현재 초기값(갈래 · 비중) — [확인] 때 적어 둔 것. 없거나 못 읽으면 추종."""
+    try:
+        data = json.loads(_choice_path(project_root).read_text(encoding="utf-8"))
+        logic = data["logic"] if data.get("logic") in MODES else "follow"
+        return {"logic": logic, "weights": resolve_weights(logic, data.get("weights"))}
+    except (OSError, ValueError, KeyError, TypeError, AttributeError):
+        return {"logic": "follow", "weights": resolve_weights("follow", None)}
+
+
+def write_initial_choice(
+    project_root: Path, logic: str, weights: dict[str, float] | None
+) -> dict[str, Any]:
+    """[확인] 때만 부름 — 작업본 한 칸. 다시 열기 · 다른 PC 에서도 같은 초기값."""
+    choice = {"logic": logic, "weights": resolve_weights(logic, weights)}
+    path = _choice_path(project_root)
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(json.dumps(choice, ensure_ascii=False), encoding="utf-8")
+    return choice
+
+
 def resolve_weights(mode: str, weights: dict[str, float] | None) -> dict[str, float]:
     """갈래의 비중(합 100). weighted 가 아니면 갈래가 정한 값."""
     if mode != "weighted":
@@ -192,6 +218,7 @@ def generate_initial_route(
     )
     return {
         "mode": mode,
+        "logic": mode,
         "weights": used,
         "planned": [[round(x, 4), round(y, 4)] for x, y in outline.vertices],
         "nodes": [node.as_dict() for node in outline.nodes],
diff --git a/B05_Profile/B05_Profile_Router_Replan.py b/B05_Profile/B05_Profile_Router_Replan.py
index 0297f3b3..4ad1d17e 100644
--- a/B05_Profile/B05_Profile_Router_Replan.py
+++ b/B05_Profile/B05_Profile_Router_Replan.py
@@ -41,9 +41,10 @@ from uuid import UUID
 
 from fastapi import APIRouter
 from fastapi.responses import JSONResponse
-from pydantic import BaseModel, Field
+from pydantic import AliasChoices, BaseModel, Field
 
 from B03_FileInput.B03_FileInput_Repository import get_project_storage_relative_path
+from B05_Profile.B05_Profile_Engine_RouteInitial import read_initial_choice, write_initial_choice
 from common_util.common_util_initial_snapshot import design_route_csv_path
 from common_util.common_util_route_geometry import (
     densify_route,
@@ -96,7 +97,9 @@ class RouteInitialWeights(BaseModel):
 class RouteInitialRequest(BaseModel):
     """초기 계획노선 갈래 — follow(예상노선 추종) · earthwork · gentle · weighted."""
 
-    mode: Literal["follow", "earthwork", "gentle", "weighted"] = "follow"
+    mode: Literal["follow", "earthwork", "gentle", "weighted"] = Field(
+        "follow", validation_alias=AliasChoices("logic", "mode")
+    )
     weights: RouteInitialWeights | None = None
 
 
@@ -104,6 +107,8 @@ class RouteReplanRequest(BaseModel):
     """고친 계획노선. 정점은 시점 → 종점 순서(사업지 좌표계 m)."""
 
     vertices: list[RouteVertexInput] = Field(default_factory=list)
+    initial: RouteInitialRequest | None = None
+    """이 노드를 낳은 초기값(갈래 · 비중) — 성공하면 프로젝트에 적어 둔다(현재 초기값)."""
 
 
 async def _project_paths(project_id: UUID) -> tuple[Path, str] | None:
@@ -496,6 +501,7 @@ async def read_route_plan(project_id: UUID) -> dict[str, Any] | JSONResponse:
         "curve_count": len(saved_curves) if saved_curves else outline.curve_count,
         "violation_count": outline.violation_count,
         "edited": bool(working),
+        "current_initial": await asyncio.to_thread(read_initial_choice, project_root),
     }
 
 
@@ -561,7 +567,23 @@ async def replan_route(
         return JSONResponse(
             status_code=409, content={"status": "error", "message": result["error"]}
         )
-    return {"status": "success", "project_id": str(project_id), **result}
+    choice = request.initial
+    current = (
+        await asyncio.to_thread(
+            write_initial_choice,
+            project_root,
+            choice.mode,
+            choice.weights.model_dump() if choice.weights else None,
+        )
+        if choice
+        else await asyncio.to_thread(read_initial_choice, project_root)
+    )
+    return {
+        "status": "success",
+        "project_id": str(project_id),
+        **result,
+        "current_initial": current,
+    }
 
 
 @router.post("/{project_id}/route/replan/reset", response_model=None)
@@ -656,4 +678,10 @@ async def initial_route(
         result["metrics"]["length_m"],
         result["metrics"]["offset_avg_m"],
     )
-    return {"status": "success", "project_id": str(project_id), **result}
+    current = await asyncio.to_thread(read_initial_choice, project_root)
+    return {
+        "status": "success",
+        "project_id": str(project_id),
+        **result,
+        "current_initial": current,
+    }
diff --git a/resources/tester/test_route_initial.py b/resources/tester/test_route_initial.py
index bf3b850d..b75fec21 100644
--- a/resources/tester/test_route_initial.py
+++ b/resources/tester/test_route_initial.py
@@ -13,8 +13,10 @@ from B05_Profile.B05_Profile_Engine_RouteInitial import (
     Terrain,
     generate_initial_route,
     grade_line,
+    read_initial_choice,
     resolve_weights,
     stream_lines,
+    write_initial_choice,
 )
 
 GRADE = 0.14
@@ -124,3 +126,24 @@ def test_weights_and_stream_filter() -> None:
 def test_unknown_mode_rejected(hill: Terrain) -> None:
     with pytest.raises(ValueError):
         _run(hill, "shortest")
+
+
+def test_initial_choice_roundtrip(tmp_path) -> None:
+    """[확인] 때 적은 현재 초기값을 다시 읽음 · 없거나 깨지면 추종."""
+    assert read_initial_choice(tmp_path)["logic"] == "follow"
+    write_initial_choice(tmp_path, "weighted", {"expected": 60, "earthwork": 20, "grade": 20})
+    assert read_initial_choice(tmp_path) == {
+        "logic": "weighted",
+        "weights": {"expected": 60.0, "earthwork": 20.0, "grade": 20.0},
+    }
+    (tmp_path / "B05_Profile" / "route" / "initial_choice.json").write_text("{", encoding="utf-8")
+    assert read_initial_choice(tmp_path)["logic"] == "follow"
+
+
+def test_request_accepts_logic_name() -> None:
+    from B05_Profile.B05_Profile_Router_Replan import RouteInitialRequest, RouteReplanRequest
+
+    assert RouteInitialRequest.model_validate({"logic": "gentle"}).mode == "gentle"
+    assert RouteInitialRequest.model_validate({"mode": "earthwork"}).mode == "earthwork"
+    replan = RouteReplanRequest.model_validate({"vertices": [], "initial": {"logic": "weighted"}})
+    assert replan.initial is not None and replan.initial.mode == "weighted"