diff --git a/M01_MasterData/M01_MasterData_UI_Side.ts b/M01_MasterData/M01_MasterData_UI_Side.ts
index 8b16695e..7567367b 100644
--- a/M01_MasterData/M01_MasterData_UI_Side.ts
+++ b/M01_MasterData/M01_MasterData_UI_Side.ts
@@ -150,6 +150,8 @@ export function buildSide(
   const runs = new Map<string, () => void>();
   let restoring = false;
   let onPicked = (): void => {};
+  /** 컨테이너별로 마지막에 고른 거름 줄 — 다시 펼칠 때 그 목록을 되살림(재료는 파일이 둘) */
+  const lastRun = new Map<Group, string>();
 
   const setActive = (id: string | null): void => {
     for (const [key, button] of buttons) button.classList.toggle("is-active", key === id);
@@ -232,6 +234,7 @@ export function buildSide(
         /* 기억 못 해도 거름은 됨 */
       }
       setActive(a.id);
+      lastRun.set(a.id.split(/[|\n]/)[0] as Group, a.id);
       a.onPick(
         sub.select.value,
         d,
@@ -402,12 +405,12 @@ export function buildSide(
         onOpen({ group, file: one, sub: "", detail: "", label: L(GROUP_TITLE[group]) });
       });
     }
-    if (FILTERED.includes(group)) {
+    if (FILTERED.includes(group) || group === "재료") {
       root.querySelector(".ui-collapsible__title")?.addEventListener("click", () => {
         if (!root.classList.contains("is-collapsed")) return; // 닫을 때는 그대로 둠
         restoring = true;
         try {
-          runs.get(`${group}|`)?.();
+          runs.get(lastRun.get(group) ?? (group === "재료" ? "" : `${group}|`))?.();
         } finally {
           restoring = false;
         }