diff --git a/A00_Common/main.ts b/A00_Common/main.ts
index 529fdbc5..192dc84f 100644
--- a/A00_Common/main.ts
+++ b/A00_Common/main.ts
@@ -12,7 +12,13 @@ import "@ui/ui_template_theme.css";
 import { injectBaseStyles } from "@ui/ui_template_elements";
 import { ROUTES, type RoutePath } from "@config/config_frontend";
 import { initThemeAndLang, injectShellStyles, renderShell } from "./app_shell";
-import { currentRoute, renderCurrentRoute, ensureInitialHash } from "./router";
+import {
+  currentRoute,
+  renderCurrentRoute,
+  ensureInitialHash,
+  setLeaveGuard,
+  takeLeaveGuard,
+} from "./router";
 
 const FOOTERLESS_ROUTES: readonly RoutePath[] = [
   ROUTES.B01_ACCOUNT,
@@ -44,14 +50,27 @@ function bootstrap(): void {
   initThemeAndLang();
 
   // 3. 셸 렌더 + 현재 라우트 렌더를 함께 수행하는 헬퍼
+  let shown = "";
   const renderAll = (): void => {
+    shown = currentRoute();
     const showFooter = !FOOTERLESS_ROUTES.includes(currentRoute());
     const outlet = renderShell(appRoot, showFooter); // 헤더/푸터(로그인·언어 반영) 갱신
     void renderCurrentRoute(outlet); // 아울렛에 페이지 렌더
   };
 
   // 4. hashchange 1회 구독 (리스너 누적 방지)
-  window.addEventListener("hashchange", renderAll);
+  window.addEventListener("hashchange", () => {
+    const guard = takeLeaveGuard();
+    if (!guard || currentRoute() === shown) return renderAll();
+    void guard().then((ok) => {
+      if (ok) {
+        setLeaveGuard(null);
+        renderAll();
+      } else {
+        history.replaceState(null, "", `#/${shown}`); // 취소 — 머문 채 주소만 되돌림
+      }
+    });
+  });
 
   // 5. 최초 진입
   ensureInitialHash();
diff --git a/A00_Common/router.ts b/A00_Common/router.ts
index 38f59c3d..ae56148f 100644
--- a/A00_Common/router.ts
+++ b/A00_Common/router.ts
@@ -65,6 +65,13 @@ const routeTable: Partial<Record<RoutePath, () => Promise<PageRenderer>>> = {
     (await import("../M02_MasterTemplete/M02_MasterTemplete_UI_Page")).renderM02MasterTemplate,
 };
 
+/** 페이지가 떠나기 전에 묻는 자리 — false 를 돌려주면 이동을 취소(주소도 되돌림). 이동이 끝나면 비워짐. */
+let leaveGuard: (() => Promise<boolean>) | null = null;
+export const setLeaveGuard = (guard: (() => Promise<boolean>) | null): void => {
+  leaveGuard = guard;
+};
+export const takeLeaveGuard = (): (() => Promise<boolean>) | null => leaveGuard;
+
 /** 로그인 여부 (토큰 존재 확인) */
 export async function isAuthenticated(): Promise<boolean> {
   const { fetchSession } = await import("../A06_Login/A06_Login_Api_Fetch");
diff --git a/M02_MasterTemplete/M02_MasterTemplete_Api_Fetch.ts b/M02_MasterTemplete/M02_MasterTemplete_Api_Fetch.ts
index 9fe59d66..ca67f4c9 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Api_Fetch.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_Api_Fetch.ts
@@ -83,13 +83,14 @@ export const saveTemplate = (
 export const deleteTemplate = (kind: Kind, name: string, 판: string): Promise<{ ok: boolean }> =>
   call(`/templates/${kind}/${enc(name)}?판=${enc(판)}`, { method: "DELETE" });
 
-/** 개인·회사 층에서 지움 — 서버 길은 sub4 (없으면 404) */
+/** 개인·회사 층에서 지움 — 판이 맞을 때만(다르면 409) */
 export const deleteLayerTemplate = (
   layer: Layer,
   kind: Kind,
   name: string,
+  판: string,
 ): Promise<{ ok: boolean }> =>
-  call(`/layers/${layer}/templates/${kind}/${enc(name)}`, { method: "DELETE" });
+  call(`/layers/${layer}/templates/${kind}/${enc(name)}?판=${enc(판)}`, { method: "DELETE" });
 
 /* --- 프로젝트 층 단추 다섯 --- */
 const project = (id: string, tail: string): string => `/projects/${enc(id)}/templates/${tail}`;
diff --git a/M02_MasterTemplete/M02_MasterTemplete_UI_Main.ts b/M02_MasterTemplete/M02_MasterTemplete_UI_Main.ts
index 516c1bae..97cb7ddd 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_UI_Main.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_UI_Main.ts
@@ -4,6 +4,7 @@
  * 부품 파일이 없거나 못 읽어도 페이지는 뜸 — 빈 자리 글.
  * ========================================================================== */
 
+import { setLeaveGuard } from "../A00_Common/router";
 import { createButton, el, showConfirmDialog, showToast } from "@ui/ui_template_elements";
 import { t as L } from "@ui/ui_template_locale";
 import {
@@ -92,6 +93,7 @@ export function createMain(isAdmin: boolean, onSaved?: () => void): MainHandle {
     dirty = false;
     return true;
   };
+  setLeaveGuard(confirmLeave); // 머리 메뉴 · 뒤로 가기로 떠날 때도 물음
 
   const showNotice = (nodes: (HTMLElement | string)[]): void => {
     notice.replaceChildren(...nodes);
diff --git a/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts b/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
index b9474ecc..4d30e180 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
@@ -365,7 +365,7 @@ export function buildSide(opt: SideOptions): SideHandle {
     if (!(await showConfirmDialog(L("M02_DeleteConfirm").replace("{value}", info.이름)))) return;
     try {
       if (layer === "system") await deleteTemplate(info.종류, info.이름, info.판);
-      else await deleteLayerTemplate(layer, info.종류, info.이름);
+      else await deleteLayerTemplate(layer, info.종류, info.이름, info.판);
       showToast(L("M02_Deleted"), "success");
       opt.onOpen(null);
       await refresh();
@@ -406,7 +406,12 @@ export function buildSide(opt: SideOptions): SideHandle {
     } catch (error) {
       return failed(error);
     }
-    void act(() => saveProjectAs(projectId, to, cur.kind, cur.name));
+    try {
+      await saveProjectAs(projectId, to, cur.kind, cur.name);
+      showToast(L("M02_Done"), "success"); // 열던 양식은 그대로 둠
+    } catch (error) {
+      failed(error);
+    }
   };
   projectButton(L("M02_ProjectReset"), async () => {
     if (await showConfirmDialog(L("M02_ResetConfirm"))) void act(() => resetProject(projectId));