diff --git a/frontend/src/components/TradingChart.tsx b/frontend/src/components/TradingChart.tsx
index b7762aa..41c788d 100644
--- a/frontend/src/components/TradingChart.tsx
+++ b/frontend/src/components/TradingChart.tsx
@@ -7,6 +7,20 @@ import { DISPLAY_COUNT } from '../hooks/useUpbitData';
 
 /** Upbit 실시간 — 초기 히스토리가 이 개수 미만이면 setData 하지 않음 (종목 전환 직후 1~2봉만 로드되는 깨짐 방지) */
 const MIN_BARS_FOR_FULL_RELOAD = Math.min(50, Math.floor(DISPLAY_COUNT / 4));
+
+/** 종목 전환 직후 stale/partial 데이터 차단 — fetch 완료(barsMarket 확정) 후 sparse history도 렌더 허용 */
+function canApplyChartBars(
+  barData: OHLCVBar[],
+  barsMarket: string | null | undefined,
+  market: string,
+): boolean {
+  if (barData.length === 0) return false;
+  if (barsMarket === undefined) return true;
+  if (barsMarket == null || barsMarket !== market) return false;
+  if (!market.startsWith('KRW-')) return true;
+  if (barData.length >= MIN_BARS_FOR_FULL_RELOAD) return true;
+  return barData.length >= 2;
+}
 import DrawingCanvas, { hitTestDrawing } from './DrawingCanvas';
 import PaneLegend, { type PaneLegendProps } from './PaneLegend';
 import ChartHoverToolbar from './ChartHoverToolbar';
@@ -167,14 +181,9 @@ const TradingChart: React.FC<TradingChartProps> = ({
   const [candleOnlyMode, setCandleOnlyMode] = useState(false);
 
   useEffect(() => {
-    const ready = barsMarket == null
-      ? false
-      : barsMarket === undefined
-        ? true
-        : barsMarket === market;
-    if (ready) {
+    if (barsMarket === market) {
       barsRef.current = bars;
-    } else if (barsMarket != null && barsMarket !== market) {
+    } else {
       barsRef.current = [];
     }
   }, [bars, barsMarket, market]);
@@ -296,8 +305,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
       const barData = barsRef.current;
       const inds = indicatorsRef.current;
       if (!m || barData.length === 0) return;
-      if (barsMarket !== undefined && barsMarket !== market) return;
-      if (market.startsWith('KRW-') && barData.length < MIN_BARS_FOR_FULL_RELOAD) return;
+      if (!canApplyChartBars(barData, barsMarket, market)) return;
       prevBarsKey.current = '';
       reloadAllRef.current?.(
         m, barData,
@@ -315,7 +323,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
       const barData = barsRef.current;
       const inds = indicatorsRef.current;
       if (!m || barData.length === 0) return;
-      if (barsMarket !== undefined && barsMarket !== market) return;
+      if (!canApplyChartBars(barData, barsMarket, market)) return;
 
       const expected = countExpectedVisibleIndicators(inds);
       if (expected === 0) return;
@@ -699,8 +707,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
       // 데이터가 이미 barsRef에 있지만 차트에 아직 세팅되지 않은 경우 (예: 멀티레이아웃 초기 렌더) 재로드
       if (barsRef.current.length > 0 && !m.hasMainSeries()) {
         const bm = barsMarketRef.current;
-        if (bm != null && bm !== marketRef.current) return;
-        if (marketRef.current.startsWith('KRW-') && barsRef.current.length < MIN_BARS_FOR_FULL_RELOAD) return;
+        if (!canApplyChartBars(barsRef.current, bm, marketRef.current)) return;
         void reloadAll(
           m,
           barsRef.current,
@@ -723,6 +730,22 @@ const TradingChart: React.FC<TradingChartProps> = ({
     });
     ro.observe(containerRef.current);
 
+    const bootstrapIfReady = () => {
+      const m = managerRef.current;
+      if (!m || m.hasMainSeries()) return;
+      const data = barsRef.current;
+      if (!canApplyChartBars(data, barsMarketRef.current, marketRef.current)) return;
+      void reloadAllRef.current(
+        m,
+        data,
+        prevChartType.current,
+        prevTheme.current,
+        prevLogScale.current,
+        indicatorsRef.current,
+      );
+    };
+    requestAnimationFrame(() => requestAnimationFrame(bootstrapIfReady));
+
     return () => {
       unsub();
       unsubClick();
@@ -772,12 +795,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
   useEffect(() => {
     const mgr = managerRef.current;
     if (!mgr || !chartMgr || bars.length === 0) return;
-
-    const barsReady = barsMarket === undefined
-      ? true
-      : barsMarket === market;
-    if (!barsReady) return;
-    if (market.startsWith('KRW-') && bars.length < MIN_BARS_FOR_FULL_RELOAD) return;
+    if (!canApplyChartBars(bars, barsMarket, market)) return;
 
     // manager 준비 전 bars 가 먼저 도착한 경우(로그인 직후 등) 메인 시리즈 누락 방지
     if (!mgr.hasMainSeries()) {
@@ -887,7 +905,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
   useEffect(() => {
     const mgr = managerRef.current;
     if (!mgr || !chartMgr || bars.length === 0) return;
-    if (barsMarket !== undefined && barsMarket !== market) return;
+    if (!canApplyChartBars(bars, barsMarket, market)) return;
 
     const expected = countExpectedVisibleIndicators(indicators);
     if (expected === 0) return;
@@ -897,7 +915,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
       window.setTimeout(() => {
         const m = managerRef.current;
         if (!m || !m.hasMainSeries()) return;
-        if (barsMarket !== undefined && barsMarket !== market) return;
+        if (!canApplyChartBars(bars, barsMarket, market)) return;
         const exp = countExpectedVisibleIndicators(indicatorsRef.current);
         if (exp === 0 || m.getLoadedIndicatorCount() >= exp) return;
         prevBarsKey.current = '';
diff --git a/frontend/src/hooks/useStompChartData.ts b/frontend/src/hooks/useStompChartData.ts
index f37c9d3..a2596be 100644
--- a/frontend/src/hooks/useStompChartData.ts
+++ b/frontend/src/hooks/useStompChartData.ts
@@ -141,7 +141,7 @@ export function useStompChartData(
       .then(newBars => {
         if (cancelled) return;
         barsRef.current = newBars;
-        historyReadyRef.current = newBars.length > 0;
+        historyReadyRef.current = true;
         setBarsMarket(market);
         setBars(newBars);
         setLatestBar(newBars[newBars.length - 1] ?? null);
@@ -269,6 +269,9 @@ export function useStompChartData(
     last1mVolRef.current = 0;
     last1mTimeRef.current = 0;
     void pinChartWatch(market, STOMP_TICK_CANDLE_TYPE);
+    if (candleType !== STOMP_TICK_CANDLE_TYPE) {
+      void pinChartWatch(market, candleType);
+    }
 
     const topic = `/sub/charts/${market}/${STOMP_TICK_CANDLE_TYPE}`;
     let alive = true;