diff --git a/M02_MasterTemplete/M02_MasterTemplete_UI_Main.ts b/M02_MasterTemplete/M02_MasterTemplete_UI_Main.ts
index 3da28021..f5bb0458 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_UI_Main.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_UI_Main.ts
@@ -93,7 +93,12 @@ export function canEdit(layer: Layer, isAdmin: boolean): boolean {
   return layer === "project" || layer === "personal" || (layer === "system" && isAdmin);
 }
 
-export function createMain(isAdmin: boolean, onSaved?: () => void): MainHandle {
+/** `onOpened` — 무엇을 열든(좌측 · 카드 [도면 수정] · 다시 읽기) 연 바로 뒤 부름(좌측 고름 표시) */
+export function createMain(
+  isAdmin: boolean,
+  onSaved?: () => void,
+  onOpened?: () => void,
+): MainHandle {
   const title = el("h2", { className: "m02-main__title", text: L("M02_PickTemplate") });
   const reload = createButton({ label: L("M02_Reload"), variant: "ghost" });
   const save = createButton({ label: L("M02_Save"), variant: "filled" });
@@ -363,6 +368,7 @@ export function createMain(isAdmin: boolean, onSaved?: () => void): MainHandle {
     drop();
     showNotice([]);
     sel = next;
+    onOpened?.();
     bar();
     if (!next) {
       title.textContent = L("M02_PickTemplate");
diff --git a/M02_MasterTemplete/M02_MasterTemplete_UI_Page.ts b/M02_MasterTemplete/M02_MasterTemplete_UI_Page.ts
index 89350db2..8d20be4c 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_UI_Page.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_UI_Page.ts
@@ -17,7 +17,11 @@ import "./M02_MasterTemplete_UI_Style.css";
 export async function renderM02MasterTemplate(root: HTMLElement): Promise<void> {
   const user = await fetchSessionUser().catch(() => null);
   const isAdmin = user?.role === "SYSTEM_ADMIN";
-  const main = createMain(isAdmin, () => void side.refresh());
+  const main = createMain(
+    isAdmin,
+    () => void side.refresh(),
+    () => side.paint(),
+  );
   const side = buildSide({
     isAdmin,
     onOpen: (sel) => void main.open(sel),
diff --git a/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts b/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
index 9eec9861..9eb2d162 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
@@ -80,8 +80,8 @@ export interface SideOptions {
 export interface SideHandle {
   root: HTMLElement;
   refresh: () => Promise<void>;
-  /** 좌측 고름 표시만 옮김 — 화면은 열지 않음 */
-  select: (kind: Kind, name: string) => void;
+  /** 고름 표시를 지금 열린 것 한 줄로 — 편집 칸이 무엇을 열든(카드 [도면 수정] 등) 부름 */
+  paint: () => void;
 }
 
 /** 서버 이름 규칙과 같게 — 화면에서 먼저 막음 */
@@ -102,8 +102,6 @@ export function buildSide(opt: SideOptions): SideHandle {
   let numbers: Record<string, StructureNumbers> = {};
   let seq = 0;
 
-  let picked: { kind: Kind; name: string } | null = null;
-
   const section = (title: string, body: HTMLElement, ...more: HTMLElement[]): HTMLElement =>
     el("section", {
       className: "m02-side__group ui-collapsible ui-sidebar-section ui-sidebar-card is-collapsed",
@@ -140,9 +138,8 @@ export function buildSide(opt: SideOptions): SideHandle {
 
   const root = el("div", { className: "m02-side ui-sidebar-panel", children: [listHost] });
 
-  /** 고름 표시 — `picked`(방금 누름) 이 있으면 그것 · 없으면 지금 열린 것과 비교 */
+  /** 고름 표시 — 편집 칸에 지금 열린 것 하나뿐 */
   const isPicked = (kind: Kind, name: string): boolean => {
-    if (picked) return picked.kind === kind && picked.name === name;
     const cur = opt.getOpen();
     return !!cur && cur.layer === layer && cur.kind === kind && cur.name === name;
   };
@@ -199,21 +196,23 @@ export function buildSide(opt: SideOptions): SideHandle {
     for (const [kind, b] of editButtons) b.copy.disabled = b.del.disabled = cur?.종류 !== kind;
   }
 
+  /** 고름 표시는 여기서만 — 목록 · 열 줄을 함께 그려야 두 줄이 동시에 안 남음 */
+  function paint(): void {
+    paintList();
+    paintColumns();
+    paintButtons();
+  }
+
+  // 여는 것은 편집 칸(`onOpen`) — 편집 칸이 열 때마다 `paint` 를 부름(페이지가 이음)
   async function select(info: TemplateInfo): Promise<void> {
     if (!isOpen(info) && !(await opt.confirmLeave())) return;
-    picked = null;
     opt.onOpen({ layer, projectId: null, kind: info.종류, name: info.이름 });
-    paintList();
-    paintButtons();
   }
 
   async function selectColumn(col: StructureColumn, kind: ColumnKind): Promise<void> {
     if (!isPicked(kind, col.id) && !(await opt.confirmLeave())) return;
-    picked = null;
     // 제목은 편집 화면이 문서 번호를 앞에 붙임(「SD010101 돌기슭막이 …」)
     opt.onOpen({ layer, projectId: null, kind, name: col.id, label: columnHead(col) });
-    paintColumns();
-    paintButtons();
   }
 
   async function refreshStructure(): Promise<void> {
@@ -328,13 +327,5 @@ export function buildSide(opt: SideOptions): SideHandle {
   }
 
   void refresh();
-  return {
-    root,
-    refresh,
-    select: (kind, name) => {
-      picked = { kind, name };
-      paintList();
-      paintColumns();
-    },
-  };
+  return { root, refresh, paint };
 }
diff --git a/resources/tester/test_m02_structure_panel.py b/resources/tester/test_m02_structure_panel.py
index ac370442..6e832ca0 100644
--- a/resources/tester/test_m02_structure_panel.py
+++ b/resources/tester/test_m02_structure_panel.py
@@ -148,6 +148,18 @@ def test_좌측_새로_본떠_지우기는_표_도면_컨테이너_안에_하나
     assert "양식: name" in side.split("function copyTemplate")[1]  # 복사본 머리 이름 = 새 이름
 
 
+def test_좌측_고름_표시는_열린_것_한_줄뿐():
+    """카드 [도면 수정] 등 무엇으로 열든 편집 칸이 좌측 `paint` 를 부름 — 목록 · 열 줄을 함께 그림."""
+    side = _text(SIDE)
+    assert "picked" not in side  # 따로 든 고름 상태 없음 — 편집 칸의 지금 열린 것만 봄
+    assert re.search(r"function paint\(\): void \{\s*paintList\(\);\s*paintColumns\(\);", side)
+    for fn in ("async function select(", "async function selectColumn("):
+        body = side.split(fn)[1].split("\n  }\n")[0]
+        assert "paint" not in body, fn  # 여기서 한쪽만 그리면 두 줄이 남음
+    assert re.search(r"sel = next;\s*onOpened\?\.\(\);", _text(MAIN))
+    assert "() => side.paint()" in _text(M02 / "M02_MasterTemplete_UI_Page.ts")
+
+
 def test_리본_접힘_모드에서_탭으로_편_것은_밖을_누르면_다시_접힘():
     ribbon = _text(ROOT / "B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx")
     assert "if (collapsed) setPeek(true);" in ribbon  # 탭 = 잠깐 펼침(접힘 모드 유지)