diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 8d14d59..87a71d2 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -614,6 +614,8 @@ function App() {
   const managerRef = useRef<ChartManager | null>(null);
   /** 차트 매니저 준비 전 도착한 STOMP 틱 (준비 후 1회 적용) */
   const pendingRealtimeBarRef = useRef<OHLCVBar | null>(null);
+  /** reloadAll setData 완료 전 — 이전 종목 rawBars에 실시간 틱 혼입 방지 */
+  const chartLiveReadyRef = useRef(false);
   const useUpbit   = isUpbitMarket(symbol);
 
   // ── 백테스팅 ───────────────────────────────────────────────────────────────
@@ -940,6 +942,10 @@ function App() {
   // 틱 수신: 동일 캔들 업데이트 → React state 변경 없이 차트만 직접 갱신
   const handleTickUpdate = useCallback((bar: OHLCVBar) => {
     if (barsMarketRef.current !== chartContextRef.current.symbol) return;
+    if (!chartLiveReadyRef.current) {
+      pendingRealtimeBarRef.current = bar;
+      return;
+    }
     if (!managerRef.current) {
       pendingRealtimeBarRef.current = bar;
       flashWsDot();
@@ -952,6 +958,10 @@ function App() {
   // 새 캔들: bars state를 변경하지 않고 차트에 바만 추가 + 인디케이터 last point 갱신
   const handleNewCandle = useCallback((newBar: OHLCVBar) => {
     if (barsMarketRef.current !== chartContextRef.current.symbol) return;
+    if (!chartLiveReadyRef.current) {
+      pendingRealtimeBarRef.current = newBar;
+      return;
+    }
     if (!managerRef.current) {
       pendingRealtimeBarRef.current = newBar;
       flashWsDot();
@@ -961,6 +971,15 @@ function App() {
     flashWsDot();
   }, []);
 
+  const handleCandlesReady = useCallback(() => {
+    chartLiveReadyRef.current = true;
+    const pending = pendingRealtimeBarRef.current;
+    const mgr = managerRef.current;
+    if (!pending || !mgr || barsMarketRef.current !== chartContextRef.current.symbol) return;
+    pendingRealtimeBarRef.current = null;
+    mgr.updateBar(pending);
+  }, []);
+
   const chartRealtimeSource = appDefaults.chartRealtimeSource ?? 'BACKEND_STOMP';
   const { bars: upbitBars, barsMarket: upbitBarsMarket, latestBar, wsStatus, isLoading, error } = useChartRealtimeData(
     symbol,
@@ -978,8 +997,9 @@ function App() {
   const barsMarket = useUpbit ? upbitBarsMarket : symbol;
   barsMarketRef.current = barsMarket;
 
-  /** 종목·타임프레임 전환 시 이전 틱 버퍼 폐기 (paint 전에 실행) */
+  /** 종목·타임프레임 전환 시 이전 틱 버퍼·실시간 허용 플래그 초기화 (paint 전에 실행) */
   useLayoutEffect(() => {
+    chartLiveReadyRef.current = false;
     pendingRealtimeBarRef.current = null;
   }, [symbol, timeframe]);
 
@@ -1970,10 +1990,11 @@ function App() {
             onCrosshair={setLegend}
             onTradeOrderRequest={applyTradeFill}
             onDataLoaded={() => syncBacktestMarkersRef.current()}
+            onCandlesReady={handleCandlesReady}
             onManagerReady={mgr => {
               managerRef.current = mgr;
               const pending = pendingRealtimeBarRef.current;
-              if (pending && barsMarketRef.current === symbol && bars.length > 0) {
+              if (pending && chartLiveReadyRef.current && barsMarketRef.current === symbol && bars.length > 0) {
                 pendingRealtimeBarRef.current = null;
                 const last = bars[bars.length - 1];
                 if (last && pending.time === last.time) mgr.updateBar(pending);
diff --git a/frontend/src/components/ChartSlot.tsx b/frontend/src/components/ChartSlot.tsx
index 6417b68..e2260fc 100644
--- a/frontend/src/components/ChartSlot.tsx
+++ b/frontend/src/components/ChartSlot.tsx
@@ -383,6 +383,7 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
   const reloadTriggeredRef = useRef(false); // 재마운트는 최대 1회
   useLayoutEffect(() => {
     reloadTriggeredRef.current = false;
+    chartLiveReadyRef.current = false;
     pendingRealtimeBarRef.current = null;
   }, [symbol, timeframe]);
   useEffect(() => {
@@ -429,9 +430,23 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
 
   const pendingRealtimeBarRef = useRef<OHLCVBar | null>(null);
   const barsMarketRef = useRef<string | null>(null);
+  const chartLiveReadyRef = useRef(false);
+
+  const handleCandlesReady = useCallback(() => {
+    chartLiveReadyRef.current = true;
+    const pending = pendingRealtimeBarRef.current;
+    const mgr = managerRef.current;
+    if (!pending || !mgr || barsMarketRef.current !== symbolRef.current) return;
+    pendingRealtimeBarRef.current = null;
+    mgr.updateBar(pending);
+  }, []);
 
   const handleTickUpdate = useCallback((bar: OHLCVBar) => {
     if (barsMarketRef.current !== symbolRef.current) return;
+    if (!chartLiveReadyRef.current) {
+      pendingRealtimeBarRef.current = bar;
+      return;
+    }
     if (!managerRef.current) {
       pendingRealtimeBarRef.current = bar;
       return;
@@ -440,6 +455,10 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
   }, []);
   const handleNewCandle = useCallback((bar: OHLCVBar) => {
     if (barsMarketRef.current !== symbolRef.current) return;
+    if (!chartLiveReadyRef.current) {
+      pendingRealtimeBarRef.current = bar;
+      return;
+    }
     if (!managerRef.current) {
       pendingRealtimeBarRef.current = bar;
       return;
@@ -653,7 +672,7 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
           onManagerReady={mgr => {
             managerRef.current = mgr;
             const pending = pendingRealtimeBarRef.current;
-            if (pending && barsMarketRef.current === symbolRef.current && bars.length > 0) {
+            if (pending && chartLiveReadyRef.current && barsMarketRef.current === symbolRef.current && bars.length > 0) {
               pendingRealtimeBarRef.current = null;
               const last = bars[bars.length - 1];
               if (last && pending.time === last.time) mgr.updateBar(pending);
@@ -682,6 +701,7 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
               }
             });
           }}
+          onCandlesReady={handleCandlesReady}
           onDataLoaded={() => {
             // reloadAll(setData + setInitialVisibleRange) 완료 후
             // 첫 마운트 시 pending 상태였던 sync range 를 재적용한다
diff --git a/frontend/src/components/TradingChart.tsx b/frontend/src/components/TradingChart.tsx
index 2935e0c..44c7fb9 100644
--- a/frontend/src/components/TradingChart.tsx
+++ b/frontend/src/components/TradingChart.tsx
@@ -5,10 +5,10 @@ import { ChartManager } from '../utils/ChartManager';
 import { setIndicatorChartContext } from '../utils/indicatorRegistry';
 import { DISPLAY_COUNT } from '../hooks/useUpbitData';
 
-/** Upbit 실시간 — 초기 히스토리가 이 개수 미만이면 setData 하지 않음 (종목 전환 직후 1~2봉만 로드되는 깨짐 방지) */
+/** Upbit 실시간 — 초기 히스토리가 이 개수 미만이면 setData 하지 않음 (종목 전환 직후 sparse 봉 → 캔들 폭 비정상) */
 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 */
+/** 종목 전환 직후 stale/partial 데이터 차단 — fetch 완료(barsMarket 확정) + 충분한 히스토리만 렌더 */
 function canApplyChartBars(
   barData: OHLCVBar[],
   barsMarket: string | null | undefined,
@@ -17,9 +17,8 @@ function canApplyChartBars(
   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;
+  if (!market.startsWith('KRW-')) return barData.length >= 2;
+  return barData.length >= MIN_BARS_FOR_FULL_RELOAD;
 }
 import DrawingCanvas, { hitTestDrawing } from './DrawingCanvas';
 import PaneLegend, { type PaneLegendProps } from './PaneLegend';
@@ -74,6 +73,8 @@ interface TradingChartProps {
    * ChartSlot 에서 멀티차트 첫 마운트 시 sync range 를 재적용하는 데 사용.
    */
   onDataLoaded?: () => void;
+  /** setData 직후 캔들·볼륨 반영 완료 — 실시간 틱 허용 시점 (지표 로드 전) */
+  onCandlesReady?: () => void;
   /** 보조지표 pane 순서 변경 (드래그 핸들): fromId 를 insertBeforeId 앞으로 이동 (null = 맨 뒤) */
   onReorderIndicators?: (fromId: string, insertBeforeId: string | null) => void;
   /** 보조지표 pane 병합 */
@@ -109,6 +110,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
   magnifierEnabled = false,
   onMagnifierClose,
   onDataLoaded,
+  onCandlesReady,
   onReorderIndicators,
   onMergeIndicators,
   onSplitIndicatorPane,
@@ -385,13 +387,13 @@ const TradingChart: React.FC<TradingChartProps> = ({
       do {
         reloadCoalesceRef.current = false;
         const gen = reloadGenRef.current;
-        const barData = barsRef.current.length > 0 ? barsRef.current : newBars;
-        if (barData.length === 0) break;
+        if (newBars.length === 0) break;
 
         reloadSafetyTimers.current.forEach(clearTimeout);
         reloadSafetyTimers.current = [];
 
-        barsRef.current = barData;
+        barsRef.current = newBars;
+        const barData = newBars;
 
         mgr.setData(barData, ct, th);
         if (gen !== reloadGenRef.current) {
@@ -402,6 +404,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
         mgr.setLogScale(ls);
         mgr.setDisplayTimezone(displayTimezone, timeframe);
         commitCandleLayout(mgr);
+        onCandlesReady?.();
 
         let stale = false;
         for (const ind of inds) {
@@ -489,7 +492,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
         queueFullReload();
       }
     }
-  }, [applyPaneLayout, commitCandleLayout, onDataLoaded, displayTimezone, timeframe, market, queueFullReload, queueIndicatorRecovery]);
+  }, [applyPaneLayout, commitCandleLayout, onCandlesReady, onDataLoaded, displayTimezone, timeframe, market, queueFullReload, queueIndicatorRecovery]);
 
   useEffect(() => {
     reloadAllRef.current = reloadAll;
@@ -822,6 +825,7 @@ const TradingChart: React.FC<TradingChartProps> = ({
     reloadCoalesceRef.current = false;
     reloadSafetyTimers.current.forEach(clearTimeout);
     reloadSafetyTimers.current = [];
+    managerRef.current?.clearForSymbolChange();
     managerRef.current?.cancelPendingIndicatorUpdates();
   }, [market, timeframe]);
 
diff --git a/frontend/src/utils/ChartManager.ts b/frontend/src/utils/ChartManager.ts
index efb9517..9d7d0ab 100644
--- a/frontend/src/utils/ChartManager.ts
+++ b/frontend/src/utils/ChartManager.ts
@@ -271,6 +271,29 @@ export class ChartManager {
   }
 
   // ─── Data ───────────────────────────────────────────────────────────────
+
+  /** 종목·타임프레임 전환 직후 — 이전 시리즈·rawBars 제거 (실시간 틱 혼입·캔들 폭 깨짐 방지) */
+  clearForSymbolChange(): void {
+    this.cancelPendingIndicatorUpdates();
+    this._dataGeneration += 1;
+
+    for (const entry of this.indicators.values()) {
+      if (entry.cloudPlugin) {
+        for (const s of entry.seriesList) { try { s.detachPrimitive(entry.cloudPlugin); } catch { /* ok */ } }
+      }
+      detachBbBandFill(entry);
+      for (const s of entry.seriesList) { try { this.chart.removeSeries(s); } catch { /* ok */ } }
+    }
+    this.indicators.clear();
+    this.patternMarkers = [];
+    this._removeExtraSubPanes();
+
+    this._disposeMainMarkersPlugin();
+    if (this.mainSeries)   { try { this.chart.removeSeries(this.mainSeries); } catch { /* ok */ } this.mainSeries = null; }
+    if (this.volumeSeries) { try { this.chart.removeSeries(this.volumeSeries); } catch { /* ok */ } this.volumeSeries = null; }
+    this.rawBars = [];
+  }
+
   setData(bars: OHLCVBar[], chartType: ChartType, theme: Theme): void {
     // 전체 재로드 전: 진행 중인 지표 갱신 타이머·플래그를 초기화해
     // 이전 rawBars 기반의 stale 계산이 새 지표에 적용되는 것을 방지한다.