diff --git a/D03_PlanAnalysis/D03_PlanAnalysis_UI_Edit.ts b/D03_PlanAnalysis/D03_PlanAnalysis_UI_Edit.ts
index 259eb0f29..4feb44586 100644
--- a/D03_PlanAnalysis/D03_PlanAnalysis_UI_Edit.ts
+++ b/D03_PlanAnalysis/D03_PlanAnalysis_UI_Edit.ts
@@ -61,6 +61,9 @@ export type { PlanScope, PlanSelection } from "./D03_PlanAnalysis_UI_Select";
 const DRAG_PX = 4;
 /** 마크를 선에서 이만큼(px) 넘게 끌어내면 지움. */
 const MARK_OFF_PX = 3 * SNAP_PX;
+/** 고름 강조 — 노랑 줄 굵기 · 검은 테 한쪽 두께(px). */
+export const PICK_LINE_PX = 8;
+export const PICK_HALO_PX = 4;
 
 export interface PlanEditParams {
   network: () => PlanNetwork;
@@ -319,7 +322,12 @@ export function createPlanEdit(params: PlanEditParams): PlanEdit {
           if (i) context.lineTo(sx, sy);
           else context.moveTo(sx, sy);
         });
-        strokeCased(context, colors.active, 8); // 밝은 바탕 대비 = 검은 테(600-1)
+        // 밝은 위성 위에서도 윤곽이 읽히게 검은 테를 한쪽 4 px 로 두껍게(613-2)
+        context.setLineDash([]);
+        context.lineWidth = PICK_LINE_PX + 2 * PICK_HALO_PX;
+        context.strokeStyle = colors.casing;
+        context.stroke();
+        strokeCased(context, colors.active, PICK_LINE_PX);
       }
       // 꺾임점 손잡이(고른 것이 든 선)
       const lines = pickedLines(network);
diff --git a/resources/tester/test_551_2_draw_tokens.py b/resources/tester/test_551_2_draw_tokens.py
index 2be72965d..74130a9a1 100644
--- a/resources/tester/test_551_2_draw_tokens.py
+++ b/resources/tester/test_551_2_draw_tokens.py
@@ -190,3 +190,23 @@ def test_paint_network_uses_cased_route_lines():
     body = src[src.index("export function paintNetwork") : src.index("export function pointLayer")]
     assert "strokeCased(context, color, width)" in body
     assert "routeColor(index)" in body
+
+
+def test_pick_highlight_readable_on_any_map_background():
+    """613-2 고름 강조 = 노랑 줄(`--draw-map-sketch`) + 검은 테 — 바탕(위성 · 어두운 지도)이 어떤 밝기여도
+    줄 · 검은 테 중 큰 쪽이 ≥ 3 : 1 · 테 한쪽 4 px 이상 · 노랑 줄은 검은 테와 함께 그림."""
+    blocks = _blocks(THEME.read_text(encoding="utf-8"))
+    yellow = _lum(blocks["light"]["--draw-map-sketch"])
+    for step in range(201):
+        ground = step / 200
+        line = (
+            (yellow + 0.05) / (ground + 0.05)
+            if yellow > ground
+            else (ground + 0.05) / (yellow + 0.05)
+        )
+        casing = (ground + 0.05) / 0.05
+        assert max(line, casing) >= 3, ground
+    src = (ROOT / "D03_PlanAnalysis/D03_PlanAnalysis_UI_Edit.ts").read_text(encoding="utf-8")
+    assert int(re.search(r"PICK_HALO_PX = (\d+)", src).group(1)) >= 4
+    assert "strokeCased(context, colors.active, PICK_LINE_PX)" in src
+    assert "context.strokeStyle = colors.casing;" in src