diff --git a/M01_MasterData/LogicBuilder/M01_LB_Check.ts b/M01_MasterData/LogicBuilder/M01_LB_Check.ts
index 075c8a9f4..95d28fc75 100644
--- a/M01_MasterData/LogicBuilder/M01_LB_Check.ts
+++ b/M01_MasterData/LogicBuilder/M01_LB_Check.ts
@@ -12,7 +12,7 @@
  * ========================================================================== */
 
 import type { CalcAnswer, LogicRow } from "../M01_MasterData_UI_Logic_Api";
-import { lbCalcLater, type LbTables } from "./M01_LB_Api";
+import { lbCalcNow, type LbTables } from "./M01_LB_Api";
 import { writeLogic, type LbLogic, type LbLookup } from "./M01_LB_Blocks";
 
 type Cell = string | number | boolean | null | [number | null, number | null];
@@ -212,20 +212,20 @@ type CalcFn = (
   tables: LbTables,
 ) => Promise<CalcAnswer>;
 
-/** LB Api 계산을 한 번 기다림 — 차례로 부르므로 「최신만」 에 안 걸림 */
-const calcOnce: CalcFn = (row, inputs, tables) =>
-  new Promise((resolve, reject) =>
-    lbCalcLater(row, inputs, tables, (ans, plain) =>
-      ans ? resolve(ans) : reject(new Error(plain ?? "")),
-    ),
-  );
+/** LB Api 바로 계산 — 화면 예시값 계산(0.3초 · 최신만)과 안 부딪힘 · 멈춤 까닭은 쉬운 말로 */
+const calcNow: CalcFn = async (row, inputs, tables) => {
+  let plain = "";
+  const ans = await lbCalcNow(row, inputs, tables, (p) => (plain = p));
+  if (!ans) throw new Error(plain);
+  return ans.ok ? ans : { ok: false, reason: plain || ans.reason };
+};
 
 /** 줄마다 시험 계산(차례로 · 하나씩) — 로직은 블록을 글로 되돌린 줄 · `calc` 는 시험에서 바꿔 끼움 */
 export async function runExpect(
   lb: LbLogic,
   tables: LbTables,
   rows: ExpectRow[],
-  calc: CalcFn = calcOnce,
+  calc: CalcFn = calcNow,
 ): Promise<ExpectResult[]> {
   const row = writeLogic(lb);
   const out: ExpectResult[] = [];