diff --git a/backend/src/main/java/com/goldenchart/service/StrategyConditionThresholdNormalizer.java b/backend/src/main/java/com/goldenchart/service/StrategyConditionThresholdNormalizer.java
index a25cc4e..4754ad9 100644
--- a/backend/src/main/java/com/goldenchart/service/StrategyConditionThresholdNormalizer.java
+++ b/backend/src/main/java/com/goldenchart/service/StrategyConditionThresholdNormalizer.java
@@ -4,6 +4,7 @@ import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 
 import java.util.Map;
+import java.util.Locale;
 
 /**
  * 전략 조건 DSL — K_50 등 직접입력 스냅샷을 hline 역할(HL_MID 등)로 정규화.
@@ -37,11 +38,15 @@ public final class StrategyConditionThresholdNormalizer {
     }
 
     private static void normalizeCondition(ObjectNode cond) {
-        normalizeThresholdField(cond, "rightField");
-        normalizeThresholdField(cond, "leftField");
+        String indType = cond.path("indicatorType").asText("").toUpperCase(Locale.ROOT);
+        if (!indType.isBlank()) {
+            cond.put("indicatorType", indType);
+        }
+        normalizeThresholdField(cond, "rightField", indType);
+        normalizeThresholdField(cond, "leftField", indType);
     }
 
-    private static void normalizeThresholdField(ObjectNode cond, String fieldKey) {
+    private static void normalizeThresholdField(ObjectNode cond, String fieldKey, String indType) {
         String field = cond.path(fieldKey).asText("");
         if (field.isBlank()) return;
 
@@ -49,7 +54,7 @@ public final class StrategyConditionThresholdNormalizer {
         Double value = readThresholdValue(cond, field);
 
         if (override || field.startsWith("K_")) {
-            String role = inferRoleForValue(cond.path("indicatorType").asText(""), value, field);
+            String role = inferRoleForValue(indType, value, field);
             if (role != null) {
                 cond.put(fieldKey, role);
                 cond.remove("targetValue");
@@ -59,7 +64,7 @@ public final class StrategyConditionThresholdNormalizer {
         }
 
         if (!override && field.startsWith("K_")) {
-            String role = inferRoleForValue(cond.path("indicatorType").asText(""), value, field);
+            String role = inferRoleForValue(indType, value, field);
             if (role != null) {
                 cond.put(fieldKey, role);
                 cond.remove("targetValue");
diff --git a/backend/src/main/java/com/goldenchart/service/StrategyService.java b/backend/src/main/java/com/goldenchart/service/StrategyService.java
index 5b39635..9b26382 100644
--- a/backend/src/main/java/com/goldenchart/service/StrategyService.java
+++ b/backend/src/main/java/com/goldenchart/service/StrategyService.java
@@ -152,10 +152,14 @@ public class StrategyService {
         dto.setCreatedAt(e.getCreatedAt());
         dto.setUpdatedAt(e.getUpdatedAt());
         try {
-            if (e.getBuyConditionJson() != null)
-                dto.setBuyCondition(objectMapper.readTree(e.getBuyConditionJson()));
-            if (e.getSellConditionJson() != null)
-                dto.setSellCondition(objectMapper.readTree(e.getSellConditionJson()));
+            if (e.getBuyConditionJson() != null) {
+                JsonNode buy = objectMapper.readTree(e.getBuyConditionJson());
+                dto.setBuyCondition(StrategyConditionThresholdNormalizer.normalizeTree(buy));
+            }
+            if (e.getSellConditionJson() != null) {
+                JsonNode sell = objectMapper.readTree(e.getSellConditionJson());
+                dto.setSellCondition(StrategyConditionThresholdNormalizer.normalizeTree(sell));
+            }
             if (e.getFlowLayoutJson() != null && !e.getFlowLayoutJson().isBlank())
                 dto.setFlowLayout(objectMapper.readTree(e.getFlowLayoutJson()));
         } catch (Exception ex) {
diff --git a/frontend/scripts/test-threshold-normalize.mjs b/frontend/scripts/test-threshold-normalize.mjs
new file mode 100644
index 0000000..69847f8
--- /dev/null
+++ b/frontend/scripts/test-threshold-normalize.mjs
@@ -0,0 +1,82 @@
+/** 정규화 로직 회귀 검증 — node scripts/test-threshold-normalize.mjs */
+function isThresholdOverridden(cond) {
+  return cond.thresholdOverride === true;
+}
+function parseThresholdField(field) {
+  if (!field?.startsWith('K_')) return null;
+  const n = parseFloat(field.slice(2));
+  return Number.isFinite(n) ? n : null;
+}
+const DEFAULT = { RSI: { over: 70, mid: 50, under: 30 } };
+function inferThresholdRoleForValue(value, indicatorType) {
+  const key = indicatorType?.toUpperCase?.() ?? indicatorType;
+  const th = DEFAULT[key] ?? {};
+  const eps = 0.0001;
+  if (th.over != null && Math.abs(th.over - value) < eps) return 'HL_OVER';
+  if (th.mid != null && Math.abs(th.mid - value) < eps) return 'HL_MID';
+  if (th.under != null && Math.abs(th.under - value) < eps) return 'HL_UNDER';
+  return null;
+}
+function inferFromK(field, indicatorType) {
+  if (!field?.startsWith('K_')) return null;
+  const val = parseFloat(field.slice(2));
+  return inferThresholdRoleForValue(val, indicatorType);
+}
+function coerceTargetValue(raw) {
+  if (raw == null) return null;
+  if (typeof raw === 'number') return Number.isFinite(raw) ? raw : null;
+  if (typeof raw === 'string') {
+    const n = parseFloat(raw.trim());
+    return Number.isFinite(n) ? n : null;
+  }
+  return null;
+}
+function normalizeCondition(cond) {
+  let next = { ...cond, indicatorType: cond.indicatorType?.toUpperCase?.() ?? cond.indicatorType };
+  const targetNum = coerceTargetValue(next.targetValue);
+  if (isThresholdOverridden(next)) {
+    if (targetNum != null) {
+      const role = inferThresholdRoleForValue(targetNum, next.indicatorType);
+      if (role) {
+        const { targetValue, ...rest } = next;
+        next = { ...rest, rightField: role, thresholdOverride: false };
+      }
+    } else if (next.rightField?.startsWith('K_')) {
+      const role = inferFromK(next.rightField, next.indicatorType);
+      if (role) {
+        const { targetValue, ...rest } = next;
+        next = { ...rest, rightField: role, thresholdOverride: false };
+      }
+    }
+  }
+  if (!isThresholdOverridden(next) && next.rightField?.startsWith('K_')) {
+    const role = inferFromK(next.rightField, next.indicatorType);
+    if (role) next = { ...next, rightField: role, thresholdOverride: false };
+  }
+  return next;
+}
+function isConditionCarrier(node) {
+  return !!node.condition && (node.type === 'CONDITION' || node.type == null);
+}
+function normalizeNode(node) {
+  let next = { ...node };
+  if (isConditionCarrier(node)) {
+    next = { ...node, type: node.type ?? 'CONDITION', condition: normalizeCondition(node.condition) };
+  }
+  if (next.children?.length) {
+    next.children = next.children.map(normalizeNode);
+  }
+  return next;
+}
+
+const cases = [
+  { type: 'CONDITION', condition: { indicatorType: 'RSI', rightField: 'K_50', thresholdOverride: true, targetValue: 50 } },
+  { condition: { indicatorType: 'RSI', rightField: 'K_50', thresholdOverride: true, targetValue: 50 } },
+  { type: 'TIMEFRAME', children: [{ condition: { indicatorType: 'RSI', rightField: 'K_50', thresholdOverride: true, targetValue: 50 } }] },
+];
+for (const c of cases) {
+  const r = normalizeNode(c);
+  const cond = r.condition ?? r.children?.[0]?.condition;
+  const ok = cond?.rightField === 'HL_MID' && cond?.thresholdOverride === false;
+  console.log(ok ? 'PASS' : 'FAIL', JSON.stringify(c).slice(0, 60), '=>', cond?.rightField, cond?.thresholdOverride);
+}
diff --git a/frontend/src/components/strategyEvaluation/StrategyEvaluationConditionPanel.tsx b/frontend/src/components/strategyEvaluation/StrategyEvaluationConditionPanel.tsx
index 4846be5..27066c9 100644
--- a/frontend/src/components/strategyEvaluation/StrategyEvaluationConditionPanel.tsx
+++ b/frontend/src/components/strategyEvaluation/StrategyEvaluationConditionPanel.tsx
@@ -5,6 +5,7 @@ import React, { useCallback, useMemo } from 'react';
 import type { StrategyDto } from '../../utils/backendApi';
 import { asLogicNode } from '../../utils/strategyHydrate';
 import { decodeConditionForEditor } from '../../utils/strategyConditionSerde';
+import { normalizeLogicRootForPersistence } from '../../utils/strategyConditionNormalize';
 import { buildDefFromGetParams } from '../../utils/strategyEditorShared';
 import LogicExpressionPreview from '../strategyEditor/LogicExpressionPreview';
 import LogicExpressionNarrative from '../strategyEditor/LogicExpressionNarrative';
@@ -34,11 +35,11 @@ const StrategyEvaluationConditionPanel: React.FC<Props> = ({
   const def = useMemo(() => buildDefFromGetParams(resolveGetParams), [resolveGetParams]);
 
   const buyCondition = useMemo(
-    () => (strategy ? asLogicNode(strategy.buyCondition) : null),
+    () => normalizeLogicRootForPersistence(strategy ? asLogicNode(strategy.buyCondition) : null),
     [strategy?.buyCondition],
   );
   const sellCondition = useMemo(
-    () => (strategy ? asLogicNode(strategy.sellCondition) : null),
+    () => normalizeLogicRootForPersistence(strategy ? asLogicNode(strategy.sellCondition) : null),
     [strategy?.sellCondition],
   );
 
diff --git a/frontend/src/utils/strategyConditionNormalize.ts b/frontend/src/utils/strategyConditionNormalize.ts
index 9dac30e..0bd27ab 100644
--- a/frontend/src/utils/strategyConditionNormalize.ts
+++ b/frontend/src/utils/strategyConditionNormalize.ts
@@ -21,14 +21,28 @@ import {
 } from './thresholdSymbols';
 import { repairPriceExtremePairForest } from './priceExtremeBreakoutPair';
 
+function coerceTargetValue(raw: unknown): number | null {
+  if (raw == null) return null;
+  if (typeof raw === 'number') return Number.isFinite(raw) ? raw : null;
+  if (typeof raw === 'string') {
+    const n = parseFloat(raw.trim());
+    return Number.isFinite(n) ? n : null;
+  }
+  return null;
+}
+
+function isConditionCarrier(node: LogicNode): node is LogicNode & { condition: ConditionDSL } {
+  return !!node.condition && (node.type === 'CONDITION' || node.type == null || node.type === undefined);
+}
+
 function migrateConditionThreshold(
   cond: ConditionDSL,
   def: DefType,
   signalType: 'buy' | 'sell',
 ): ConditionDSL {
   if (isThresholdOverridden(cond)) {
-    const val = cond.targetValue ?? parseThresholdField(cond.rightField);
-    if (val != null && Number.isFinite(val)) {
+    const val = coerceTargetValue(cond.targetValue) ?? parseThresholdField(cond.rightField);
+    if (val != null) {
       const role = inferThresholdRoleForValue(val, cond.indicatorType, def.hlThresh);
       if (role != null) {
         const { targetValue: _t, ...rest } = cond;
@@ -92,12 +106,20 @@ function migrateLogicNode(
   signalType: 'buy' | 'sell',
 ): LogicNode {
   let next = node;
-  if (node.type === 'CONDITION' && node.condition) {
-    next = { ...node, condition: migrateConditionForEditor(node.condition, def, signalType) };
+  if (isConditionCarrier(node)) {
+    next = {
+      ...node,
+      type: node.type ?? 'CONDITION',
+      condition: migrateConditionForEditor(node.condition, def, signalType),
+    };
   }
   if (next.children?.length) {
     next = { ...next, children: next.children.map(c => migrateLogicNode(c, def, signalType)) };
   }
+  const legacyChild = (next as LogicNode & { child?: LogicNode }).child;
+  if (legacyChild) {
+    next = { ...next, child: migrateLogicNode(legacyChild, def, signalType) } as LogicNode;
+  }
   return next;
 }
 
@@ -115,13 +137,17 @@ export function migrateLogicRootForEditor(
   return repairPriceExtremePairForest(migrated.root, migrated.orphans);
 }
 
-/** 저장 직전 — 상속 모드는 숫자 스냅샷·targetValue 제거; 직접입력도 hline 역할과 일치하면 HL_* 로 통일 */
+/** 저장·표시·평가 공통 — K_50 등을 HL_MID 로 접기 */
 export function normalizeConditionForPersistence(cond: ConditionDSL): ConditionDSL {
-  let next: ConditionDSL = { ...cond };
+  let next: ConditionDSL = {
+    ...cond,
+    indicatorType: cond.indicatorType?.toUpperCase?.() ?? cond.indicatorType,
+  };
+  const targetNum = coerceTargetValue(next.targetValue);
 
   if (isThresholdOverridden(next)) {
-    if (next.targetValue != null && Number.isFinite(next.targetValue)) {
-      const role = inferThresholdRoleForValue(next.targetValue, next.indicatorType, {});
+    if (targetNum != null) {
+      const role = inferThresholdRoleForValue(targetNum, next.indicatorType, {});
       if (role != null) {
         const { targetValue: _t, ...rest } = next;
         next = { ...rest, rightField: role, thresholdOverride: false };
@@ -168,13 +194,21 @@ export function normalizeConditionForPersistence(cond: ConditionDSL): ConditionD
 }
 
 function normalizeLogicNode(node: LogicNode): LogicNode {
-  let next = node;
-  if (node.type === 'CONDITION' && node.condition) {
-    next = { ...node, condition: normalizeConditionForPersistence(node.condition) };
+  let next: LogicNode = node;
+  if (isConditionCarrier(node)) {
+    next = {
+      ...node,
+      type: node.type ?? 'CONDITION',
+      condition: normalizeConditionForPersistence(node.condition),
+    };
   }
   if (next.children?.length) {
     next = { ...next, children: next.children.map(normalizeLogicNode) };
   }
+  const legacyChild = (next as LogicNode & { child?: LogicNode }).child;
+  if (legacyChild) {
+    next = { ...next, child: normalizeLogicNode(legacyChild) } as LogicNode;
+  }
   return next;
 }
 
diff --git a/frontend/src/utils/strategyHydrate.ts b/frontend/src/utils/strategyHydrate.ts
index 0117d32..8b0f703 100644
--- a/frontend/src/utils/strategyHydrate.ts
+++ b/frontend/src/utils/strategyHydrate.ts
@@ -45,15 +45,17 @@ export function hydrateStrategyDto(strategy: StrategyDto): StrategyDto {
   if (!layout) return next;
 
   try {
-    const buyState = decodeConditionForEditor(buy);
-    const sellState = decodeConditionForEditor(sell);
+    const normalizedBuy = asLogicNode(next.buyCondition);
+    const normalizedSell = asLogicNode(next.sellCondition);
+    const buyState = decodeConditionForEditor(normalizedBuy);
+    const sellState = decodeConditionForEditor(normalizedSell);
     const encodedBuy = encodeConditionForSave(buyState);
     const encodedSell = encodeConditionForSave(sellState);
     if (encodedBuy || encodedSell) {
       next = {
         ...next,
-        buyCondition: encodedBuy ?? buy ?? undefined,
-        sellCondition: encodedSell ?? sell ?? undefined,
+        buyCondition: encodedBuy ?? normalizedBuy ?? undefined,
+        sellCondition: encodedSell ?? normalizedSell ?? undefined,
       };
     }
   } catch {
diff --git a/frontend/src/utils/thresholdSymbols.ts b/frontend/src/utils/thresholdSymbols.ts
index 3c929e2..8e087c5 100644
--- a/frontend/src/utils/thresholdSymbols.ts
+++ b/frontend/src/utils/thresholdSymbols.ts
@@ -38,7 +38,8 @@ function mergedHlThresh(
   indicatorType: string,
   hlThresh: Record<string, HlThresh>,
 ): HlThresh {
-  return { ...DEFAULT_HL_THRESH[indicatorType], ...hlThresh[indicatorType] };
+  const key = indicatorType?.toUpperCase?.() ?? indicatorType;
+  return { ...DEFAULT_HL_THRESH[key], ...hlThresh[key], ...hlThresh[indicatorType] };
 }
 
 export function defaultThresholdForRole(