diff --git a/app/game-frontend/e2e/gameDeadlines.spec.ts b/app/game-frontend/e2e/gameDeadlines.spec.ts
index 6ea30990..e2e13942 100644
--- a/app/game-frontend/e2e/gameDeadlines.spec.ts
+++ b/app/game-frontend/e2e/gameDeadlines.spec.ts
@@ -5,7 +5,7 @@ import { gameBasePath, gameProfile, gameTrpcRoute } from './gameTestPaths.js';
 
 const wall = new Date('2026-09-16T12:00:00Z');
 const game = new Date('2026-09-16T11:50:00Z');
-type ClockCase = 'normal' | 'recovery' | 'recovery-end' | 'suspended';
+type ClockCase = 'normal' | 'recovery' | 'recovery-end' | 'suspended' | 'preopen';
 const install = async (page: Page, routeName: string, clockCase: ClockCase, displayMode: string) => {
     await page.clock.install({ time: wall });
     await page.clock.setFixedTime(wall);
@@ -48,7 +48,9 @@ const install = async (page: Page, routeName: string, clockCase: ClockCase, disp
                     serverTime: game.toISOString(),
                     serverWallTime: wall.toISOString(),
                     clockMode: 'realtime',
-                    clockRunning: clockCase !== 'suspended',
+                    clockRunning: clockCase !== 'suspended' && clockCase !== 'preopen',
+                    clockStartsAt: clockCase === 'preopen' ? new Date(wall.getTime() + 600_000).toISOString() : null,
+                    turnEngineRunning: clockCase === 'preopen' ? false : true,
                     clockRecovery:
                         clockCase === 'recovery' || clockCase === 'recovery-end'
                             ? {
@@ -170,8 +172,9 @@ const capture = async (page: Page, info: TestInfo, name: string) => {
     await page.screenshot({ path: info.outputPath(`${name}.png`), fullPage: true });
 };
 for (const width of [1365, 390]) {
-    for (const clockCase of ['normal', 'recovery', 'recovery-end', 'suspended'] as const) {
+    for (const clockCase of ['normal', 'recovery', 'recovery-end', 'suspended', 'preopen'] as const) {
         for (const routeName of ['survey', 'select-general', 'join']) {
+            if (clockCase === 'preopen' && routeName !== 'join') continue;
             test(`${routeName} GAME deadline ${clockCase} ${width}px`, async ({ page }, info) => {
                 await page.setViewportSize({ width, height: 900 });
                 const calls = await install(page, routeName, clockCase, width === 390 ? 'real' : 'game');
diff --git a/app/game-frontend/src/composables/useClockDisplay.ts b/app/game-frontend/src/composables/useClockDisplay.ts
index 985dea42..685da74b 100644
--- a/app/game-frontend/src/composables/useClockDisplay.ts
+++ b/app/game-frontend/src/composables/useClockDisplay.ts
@@ -18,6 +18,7 @@ const mode = computed({
     },
 });
 const sample = shallowRef<ReturnType<typeof sampleServerClock>>(null);
+const preopenLogicalSample = shallowRef<ReturnType<typeof sampleServerClock>>(null);
 const now = ref(Date.now());
 const engineRunning = ref<boolean | null>(null);
 const haltedAt = ref<number | null>(null);
@@ -32,6 +33,9 @@ export const receiveClockSample = (
 ): void => {
     if (!input.serverTime) return;
     const wallTime = input.serverWallTime ? new Date(input.serverWallTime).getTime() : undefined;
+    const startsAt = input.clockStartsAt ? new Date(input.clockStartsAt).getTime() : NaN;
+    const isPreopenSample =
+        input.clockMode === 'realtime' && wallTime !== undefined && Number.isFinite(startsAt) && wallTime < startsAt;
     // 메인 화면의 이전 표본을 heartbeat가 재전달해도 더 최신 lobby 표본을 되감지 않는다.
     if (
         wallTime !== undefined &&
@@ -44,14 +48,20 @@ export const receiveClockSample = (
         wallTime !== undefined &&
         wallTime === sample.value.serverWallTimeMs &&
         new Date(input.serverTime).getTime() === sample.value.serverTimeMs &&
-        input.turnEngineRunning === engineRunning.value
+        input.turnEngineRunning === engineRunning.value &&
+        isPreopenSample === (preopenLogicalSample.value !== null)
     )
         return;
+    const sampledAt = Date.now();
+    // PREOPEN's displayed clock is intentionally frozen. Its negative logical tick
+    // still advances, so candidate deadlines need the unpaused server sample.
+    preopenLogicalSample.value = isPreopenSample ? sampleServerClock(input, sampledAt) : null;
     receiveClockEngineState(input.turnEngineRunning ?? null);
     sample.value = sampleServerClock(
-        input.turnEngineRunning === false ? { ...input, clockRunning: false, clockStartsAt: null } : input
+        input.turnEngineRunning === false ? { ...input, clockRunning: false, clockStartsAt: null } : input,
+        sampledAt
     );
-    now.value = Date.now();
+    now.value = sampledAt;
 };
 
 export const advanceClockDisplay = (): void => {
@@ -64,7 +74,13 @@ const projection = computed(() =>
     sample.value ? projectServerClock(sample.value, haltedAt.value ?? now.value) : null
 );
 // 마감 판정은 표시 모드와 무관하게 서버가 투영한 GAME 시각을 사용한다.
-const gameTime = computed(() => projection.value?.time ?? null);
+const gameTime = computed(() => {
+    const preopen = preopenLogicalSample.value;
+    if (preopen) {
+        return new Date(preopen.serverTimeMs + Math.max(0, now.value - preopen.sampledClientTimeMs));
+    }
+    return projection.value?.time ?? null;
+});
 const accelerated = computed(() => projection.value?.rate === 2 && engineRunning.value !== false);
 const label = computed(() => (mode.value === 'real' ? '실제 시간 기준' : '게임 시간 기준'));
 const time = computed(() => {