diff --git a/M01_MasterData/M01_MasterData_UI_Combo_Preview.ts b/M01_MasterData/M01_MasterData_UI_Combo_Preview.ts
index b688c479..4955f7df 100644
--- a/M01_MasterData/M01_MasterData_UI_Combo_Preview.ts
+++ b/M01_MasterData/M01_MasterData_UI_Combo_Preview.ts
@@ -5,10 +5,11 @@
  * ========================================================================== */
 
 import { createInputField, createSelectField, el } from "@ui/ui_template_elements";
-import { fetchLogic, type LogicInput } from "./M01_MasterData_UI_Logic_Api";
+import { fetchAuto, fetchLogic, type LogicInput } from "./M01_MasterData_UI_Logic_Api";
 import { previewCombo, type Combo } from "./M01_MasterData_UI_Combo_Api";
 import { tc, type ComboTextKey } from "./M01_MasterData_UI_Combo_Text";
 import { formatMoney } from "./M01_MasterData_UI_Logic_Money";
+import { tx } from "./M01_MasterData_UI_Logic_Text";
 
 const COSTS = ["노무비", "재료비", "경비"] as const;
 const LABEL: Record<(typeof COSTS)[number], ComboTextKey> = {
@@ -29,6 +30,8 @@ function inputCell(
   input: LogicInput,
   key: string,
   values: Record<string, Record<string, string>>,
+  sample: Set<string>,
+  onEdit: () => void,
 ): HTMLElement {
   const mine = (values[key] ??= {});
   const value = mine[input.이름] ?? initial(input);
@@ -40,8 +43,20 @@ function inputCell(
   const control = "select" in field ? field.select : field.input;
   control.value = value;
   control.setAttribute("data-input", `${key}|${input.이름}`);
-  control.addEventListener("input", () => (mine[input.이름] = control.value));
-  control.addEventListener("change", () => (mine[input.이름] = control.value));
+  const tag = sample.has(`${key}|${input.이름}`)
+    ? el("span", { className: "m01-logic__tag", text: tx("Calc_Sample") })
+    : undefined;
+  if (tag) field.root.append(tag);
+  const edit = (): void => {
+    mine[input.이름] = control.value;
+    sample.delete(`${key}|${input.이름}`);
+    tag?.remove();
+  };
+  control.addEventListener("input", edit);
+  control.addEventListener("change", () => {
+    edit();
+    onEdit(); // 바꾸면 다시 미리 보기 계산
+  });
   return field.root;
 }
 
@@ -55,6 +70,9 @@ export function buildPreview(combo: () => Combo): PreviewHandle {
   const values: Record<string, Record<string, string>> = {};
   /** 서버가 받을 꼴 — 원래 숫자·고르기 값으로 되돌림 */
   const inputs = new Map<string, LogicInput[]>();
+  /** 견본(자동값)으로 채운 칸 `로직|입력` — 사용자가 고치면 빠짐 · 로직마다 자동값은 한 번만 받음 */
+  const sample = new Set<string>();
+  const asked = new Set<string>();
   const form = el("div", { className: "m01-logic__stack" });
   const out = el("div", {
     className: "m01-master__grid-wrap",
@@ -131,7 +149,18 @@ export function buildPreview(combo: () => Combo): PreviewHandle {
     inputs.clear();
     for (const row of combo().담은로직) {
       try {
-        const one = await fetchLogic(row.로직);
+        const [one, auto] = await Promise.all([
+          fetchLogic(row.로직),
+          asked.has(row.로직) ? Promise.resolve({}) : fetchAuto(row.로직),
+        ]);
+        asked.add(row.로직);
+        const mine = (values[row.로직] ??= {});
+        for (const i of one.logic.입력) {
+          const got = (auto as Record<string, unknown>)[i.이름];
+          if (got === undefined || got === null || (mine[i.이름] ?? "").trim() !== "") continue;
+          mine[i.이름] = String(got);
+          sample.add(`${row.로직}|${i.이름}`);
+        }
         inputs.set(row.로직, one.logic.입력);
         blocks.push(
           el("div", {
@@ -141,7 +170,9 @@ export function buildPreview(combo: () => Combo): PreviewHandle {
                 className: "m01lab__cell--wide",
                 text: `${row.로직} ${one.logic.이름}`,
               }),
-              ...one.logic.입력.map((i) => inputCell(i, row.로직, values)),
+              ...one.logic.입력.map((i) =>
+                inputCell(i, row.로직, values, sample, () => void run()),
+              ),
             ],
           }),
         );
@@ -150,7 +181,9 @@ export function buildPreview(combo: () => Combo): PreviewHandle {
       }
     }
     form.replaceChildren(...blocks);
-    out.replaceChildren(el("p", { className: "m01-logic__muted", text: tc("Prev_Wait") }));
+    if (blocks.length)
+      await run(); // 열자마자 한 번 미리 보기 계산
+    else out.replaceChildren(el("p", { className: "m01-logic__muted", text: tc("Prev_Wait") }));
   };
 
   const root = el("section", {