diff --git a/frontend/src/components/tradeNotification/TradeSignalMiniChart.tsx b/frontend/src/components/tradeNotification/TradeSignalMiniChart.tsx
index e34431b..c2a9675 100644
--- a/frontend/src/components/tradeNotification/TradeSignalMiniChart.tsx
+++ b/frontend/src/components/tradeNotification/TradeSignalMiniChart.tsx
@@ -21,6 +21,7 @@ import { DEFAULT_DISPLAY_TIMEZONE } from '../../utils/timezone';
 import { useIndicatorSettings } from '../../hooks/useIndicatorSettings';
 import { useSessionCandleOverlayControls } from '../../hooks/useSessionCandleOverlayControls';
 import { ensurePaperChartOverlays } from '../../utils/strategyToChartIndicators';
+import { enrichIndicatorConfig } from '../../utils/indicatorRegistry';
 import {
   applyNotificationSignalMarkers,
   type TradeSignalChartMarker,
@@ -68,7 +69,7 @@ const TradeSignalMiniChart: React.FC<Props> = ({
   signalMarkerRef.current = signalMarker;
 
   const baseIndicators = useMemo(
-    () => ensurePaperChartOverlays(indicators, getParams, getVisualConfig),
+    () => ensurePaperChartOverlays(indicators, getParams, getVisualConfig).map(enrichIndicatorConfig),
     [indicators, getParams, getVisualConfig],
   );
 
@@ -117,6 +118,7 @@ const TradeSignalMiniChart: React.FC<Props> = ({
     }
     syncChartLayout();
     applySignalMarkers();
+    void mgr?.repairDualLineSeries();
   }, [syncChartLayout, applySignalMarkers]);
 
   const handleManagerReady = useCallback((mgr: ChartManager) => {
@@ -162,7 +164,8 @@ const TradeSignalMiniChart: React.FC<Props> = ({
   const { isLoadingMore } = useHistoryLoader({
     symbol: market,
     timeframe,
-    isUpbit: useUpbit && enabled,
+    /** OBV — 백엔드 history volume=0 봉 prepend 시 본선 왜곡 방지 */
+    isUpbit: useUpbit && enabled && !needsDeepObv,
     managerRef,
   });
 
diff --git a/frontend/src/utils/ChartManager.ts b/frontend/src/utils/ChartManager.ts
index 472c233..820f570 100644
--- a/frontend/src/utils/ChartManager.ts
+++ b/frontend/src/utils/ChartManager.ts
@@ -217,6 +217,19 @@ function detachBbBandFill(entry: IndicatorEntry): void {
 /** OBV·CCI·RSI·TRIX — 본선+신호선 이중 plot (누락 시리즈 보정 대상) */
 const DUAL_LINE_INDICATOR_TYPES = new Set(['OBV', 'CCI', 'RSI', 'TRIX']);
 
+const DUAL_LINE_PLOT_ORDER = ['plot0', 'plot1', 'plot2', 'plot3'];
+
+function sortDualLinePlotDefs(plotDefs: PlotDef[]): PlotDef[] {
+  return [...plotDefs].sort(
+    (a, b) => DUAL_LINE_PLOT_ORDER.indexOf(a.id) - DUAL_LINE_PLOT_ORDER.indexOf(b.id),
+  );
+}
+
+/** OBV 본선(plot0) — DB plotVisibility·투명색으로 숨김 방지 */
+function isDualLinePlotForcedVisible(type: string, plotId: string): boolean {
+  return type === 'OBV' && plotId === 'plot0';
+}
+
 export class ChartManager {
   private chart: IChartApi;
   private container: HTMLElement;
@@ -741,7 +754,7 @@ export class ChartManager {
 
     for (const plotDef of plotDefs) {
       if (existingIds.has(plotDef.id)) continue;
-      if (config.plotVisibility?.[plotDef.id] === false) continue;
+      if (config.plotVisibility?.[plotDef.id] === false && !isDualLinePlotForcedVisible(config.type, plotDef.id)) continue;
       if (plotDef.type === 'histogram') continue;
 
       const plotData = result.plots[plotDef.id] as PlotData | undefined;
@@ -750,9 +763,10 @@ export class ChartManager {
       if (filtered.length === 0) continue;
 
       const isPlotVisible = !indicatorHidden
-        && (this._isCustomOverlayApplied() && (config.type === 'SMA' || config.type === 'BollingerBands' || config.type === 'IchimokuCloud')
-          ? isCustomPlotSelected(this._getAppliedCustomOverlaySelection(), config.type, plotDef.id)
-          : config.plotVisibility?.[plotDef.id] !== false);
+        && (isDualLinePlotForcedVisible(config.type, plotDef.id)
+          || (this._isCustomOverlayApplied() && (config.type === 'SMA' || config.type === 'BollingerBands' || config.type === 'IchimokuCloud')
+            ? isCustomPlotSelected(this._getAppliedCustomOverlaySelection(), config.type, plotDef.id)
+            : config.plotVisibility?.[plotDef.id] !== false));
       const showPriceLabel = this.shouldShowSeriesPriceLabel(config, true, pane);
       const showSeriesTitle = pane < 2 && showPriceLabel;
       const regPlot = def?.plots?.find(p => p.id === plotDef.id);
@@ -851,7 +865,10 @@ export class ChartManager {
         return;
       }
 
-      const plotDefs = config.plots ?? def?.plots ?? [];
+      const plotDefsRaw = config.plots ?? def?.plots ?? [];
+      const plotDefs = DUAL_LINE_INDICATOR_TYPES.has(config.type)
+        ? sortDualLinePlotDefs(plotDefsRaw)
+        : plotDefsRaw;
 
       for (const plotDef of plotDefs) {
         const plotData = result.plots[plotDef.id] as PlotData | undefined;
@@ -870,15 +887,21 @@ export class ChartManager {
           seriesMeta.push({ plotId: plotDef.id, isHistogram: true, color: plotDef.color });
         } else {
           const isPlotVisible = !indicatorHidden
-            && (this._isCustomOverlayApplied() && (config.type === 'SMA' || config.type === 'BollingerBands' || config.type === 'IchimokuCloud')
-              ? isCustomPlotSelected(this._getAppliedCustomOverlaySelection(), config.type, plotDef.id)
-              : config.plotVisibility?.[plotDef.id] !== false);
+            && (isDualLinePlotForcedVisible(config.type, plotDef.id)
+              || (this._isCustomOverlayApplied() && (config.type === 'SMA' || config.type === 'BollingerBands' || config.type === 'IchimokuCloud')
+                ? isCustomPlotSelected(this._getAppliedCustomOverlaySelection(), config.type, plotDef.id)
+                : config.plotVisibility?.[plotDef.id] !== false));
           const showPriceLabel = this.shouldShowSeriesPriceLabel(config, true, pane);
           const showSeriesTitle = pane < 2 && showPriceLabel;
           const regPlot = def?.plots?.find(p => p.id === plotDef.id);
+          const fallbackColor = config.type === 'OBV' && plotDef.id === 'plot0'
+            ? (regPlot?.color ?? '#2196F3')
+            : (regPlot?.color ?? plotDef.color ?? '#2962FF');
           series = this.chart.addSeries(LineSeries, {
-            color:            resolvePlotLineColor(plotDef.color, regPlot?.color ?? plotDef.color ?? '#2962FF'),
-            lineWidth:        Math.max(1, plotDef.lineWidth ?? 1) as 1 | 2 | 3 | 4,
+            color:            resolvePlotLineColor(plotDef.color, fallbackColor),
+            lineWidth:        (config.type === 'OBV' && plotDef.id === 'plot0'
+              ? Math.max(2, plotDef.lineWidth ?? regPlot?.lineWidth ?? 2)
+              : Math.max(1, plotDef.lineWidth ?? 1)) as 1 | 2 | 3 | 4,
             lineStyle:        plotSeriesLineStyle(plotDef.lineStyle),
             priceLineVisible: false,
             lastValueVisible: showPriceLabel,
@@ -956,6 +979,9 @@ export class ChartManager {
         return;
       }
       this.indicators.set(config.id, entry);
+      if (DUAL_LINE_INDICATOR_TYPES.has(config.type)) {
+        await this._ensureDualLinePlotSeriesForEntry(entry);
+      }
       this.applyIndicatorStyle(config);
       if (config.type === 'BollingerBands' && !indicatorHidden) {
         attachBbBandFill(entry, config, this._shouldShowBbBandFillForConfig(config));
@@ -1011,6 +1037,15 @@ export class ChartManager {
     this._notifyPaneLayout();
   }
 
+  /** OBV·RSI 등 본선(plot0) 시리즈 누락 시 재생성 (미니 차트·스타일 갱신 후) */
+  async repairDualLineSeries(): Promise<void> {
+    for (const entry of this.indicators.values()) {
+      if (!DUAL_LINE_INDICATOR_TYPES.has(entry.type)) continue;
+      await this._ensureDualLinePlotSeriesForEntry(entry);
+      if (entry.config) this.applyIndicatorStyle(entry.config);
+    }
+  }
+
   /** 여러 지표 추가 후 pane 레이아웃을 한 번만 갱신 */
   async addIndicatorsBatch(configs: IndicatorConfig[]): Promise<void> {
     for (const config of configs) {
@@ -2617,6 +2652,7 @@ export class ChartManager {
   /** custom 미적용 시 지표 설정 plotVisibility, 적용 시 custom 선택만 반영 */
   private _resolveSeriesVisible(config: IndicatorConfig, plotId: string | undefined): boolean {
     if (!plotId || !this._isIndicatorEffectivelyVisible(config)) return false;
+    if (isDualLinePlotForcedVisible(config.type, plotId)) return true;
     if (!this._isCustomOverlayApplied()) {
       return config.plotVisibility?.[plotId] !== false;
     }
@@ -2847,8 +2883,13 @@ export class ChartManager {
       }
       if (!entry.seriesMeta[i]?.isHistogram) {
         const regPlot = def?.plots?.find(p => p.id === pid);
-        opts['color'] = resolvePlotLineColor(plot.color, regPlot?.color ?? plot.color ?? '#aaa');
-        opts['lineWidth'] = Math.max(1, plot.lineWidth ?? regPlot?.lineWidth ?? 1);
+        const fallbackColor = entry.type === 'OBV' && pid === 'plot0'
+          ? (regPlot?.color ?? '#2196F3')
+          : (regPlot?.color ?? plot.color ?? '#aaa');
+        opts['color'] = resolvePlotLineColor(plot.color, fallbackColor);
+        opts['lineWidth'] = entry.type === 'OBV' && pid === 'plot0'
+          ? Math.max(2, plot.lineWidth ?? regPlot?.lineWidth ?? 2)
+          : Math.max(1, plot.lineWidth ?? regPlot?.lineWidth ?? 1);
         opts['lineStyle'] = plotSeriesLineStyle(plot.lineStyle);
         let plotAllows = true;
         if (entry.type === 'IchimokuCloud') {
diff --git a/frontend/src/utils/indicatorRegistry.ts b/frontend/src/utils/indicatorRegistry.ts
index e80bb56..01db767 100644
--- a/frontend/src/utils/indicatorRegistry.ts
+++ b/frontend/src/utils/indicatorRegistry.ts
@@ -474,12 +474,22 @@ function normalizeSignalLineIndicatorPlots(
       const reg = registryPlots.find(r => r.id === p.id);
       if (!reg) return p;
       const normalized = normalizeDualLinePlotDef(p, reg);
-      // OBV 본선 — DB 저장색(투명·신호선과 동일) 무시, registry 기본색 유지
+      // OBV 본선 — DB 저장색(투명·신호선과 동일) 무시, registry 기본색·굵기 유지
       if (p.id === 'plot0') {
-        return { ...normalized, color: reg.color };
+        return {
+          ...normalized,
+          type: 'line' as const,
+          color: reg.color,
+          lineWidth: Math.max(2, normalized.lineWidth ?? reg.lineWidth ?? 2),
+        };
       }
       return normalized;
     });
+    // plot0(본선) → plot1(신호선) 순서 보장
+    nextPlots.sort((a, b) => {
+      const order = ['plot0', 'plot1'];
+      return order.indexOf(a.id) - order.indexOf(b.id);
+    });
     return {
       plots: nextPlots,
       plotVisibility: { ...plotVisibility, plot0: true, plot1: true },