diff --git a/frontend/src/utils/IchimokuCloudPlugin.ts b/frontend/src/utils/IchimokuCloudPlugin.ts
index 09d26bb..3c96890 100644
--- a/frontend/src/utils/IchimokuCloudPlugin.ts
+++ b/frontend/src/utils/IchimokuCloudPlugin.ts
@@ -70,30 +70,31 @@ class CloudRenderer implements IPrimitivePaneRenderer {
       console.log('[IchimokuCloud] draw: skipped, data.length=', this._data.length);
       return;
     }
-    console.log('[IchimokuCloud] draw called. data.length:', this._data.length, 'bullish:', this._bullishVisible, 'bearish:', this._bearishVisible);
     const timeScale = this._chart.timeScale();
 
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     target.useBitmapCoordinateSpace(({ context: ctx, horizontalPixelRatio: hpr, verticalPixelRatio: vpr }: any) => {
+      let drawn = 0, skippedTime = 0, skippedPrice = 0;
       for (let i = 0; i < this._data.length - 1; i++) {
         const a = this._data[i];
         const b = this._data[i + 1];
 
         const x1 = timeScale.timeToCoordinate(a.time as Time);
         const x2 = timeScale.timeToCoordinate(b.time as Time);
-        if (x1 == null || x2 == null) continue;
+        if (x1 == null || x2 == null) { skippedTime++; continue; }
 
         const aAy = this._series.priceToCoordinate(a.spanA);
         const aBy = this._series.priceToCoordinate(a.spanB);
         const bAy = this._series.priceToCoordinate(b.spanA);
         const bBy = this._series.priceToCoordinate(b.spanB);
-        if (aAy == null || aBy == null || bAy == null || bBy == null) continue;
+        if (aAy == null || aBy == null || bAy == null || bBy == null) { skippedPrice++; continue; }
 
         // 한국 관례: SpanA > SpanB → 양운(빨강), SpanA <= SpanB → 음운(청록)
         const bullish = (a.spanA + b.spanA) > (a.spanB + b.spanB);
         if (bullish && !this._bullishVisible) continue;
         if (!bullish && !this._bearishVisible) continue;
 
+        drawn++;
         ctx.save();
         ctx.beginPath();
         ctx.moveTo(x1 * hpr, aAy * vpr);
@@ -105,6 +106,11 @@ class CloudRenderer implements IPrimitivePaneRenderer {
         ctx.fill();
         ctx.restore();
       }
+      if (skippedTime > 0 || skippedPrice > 0 || drawn === 0) {
+        console.warn('[IchimokuCloud] draw result: drawn=', drawn, 'skippedTime=', skippedTime, 'skippedPrice=', skippedPrice,
+          'sample time0=', this._data[0]?.time, 'x1_0=', timeScale.timeToCoordinate(this._data[0]?.time as Time),
+          'spanA0=', this._data[0]?.spanA, 'priceCoord=', this._series.priceToCoordinate(this._data[0]?.spanA));
+      }
     });
   }
 }