diff --git a/docs/plans/2026-10-21-drama-price-sync-idempotent.md b/docs/plans/2026-10-21-drama-price-sync-idempotent.md
new file mode 100644
index 0000000..e7f1638
--- /dev/null
+++ b/docs/plans/2026-10-21-drama-price-sync-idempotent.md
@@ -0,0 +1,24 @@
+# 2026-10-21 | 短剧保存始终同步分集价格（幂等纠偏）
+
+## 背景
+
+承接 K104。短剧 `free_episodes=9` 重存后，分集 5~9 仍收费。
+
+## 根因
+
+`DramaService.update()` 仅在 `freeEpisodes` / `unlockCoin` 相对更新前有变化时调用 `EpisodePriceSync`。历史数据已漂移时，同值重存不触发同步。
+
+## 方案
+
+1. 测试：覆盖「规则字段未变、分集已漂移」仍纠正。
+2. `DramaService.update()`：每次保存都调用 `EpisodePriceSync.syncByDramaRule(drama)`。
+3. `EpisodePriceSync`：仅对有差异的行走 `updateById`（已具备，保持）。
+
+## 范围
+
+只改 `fruitshorts-module-content` 的 `DramaService` / `EpisodePriceSync` / `DramaServiceTest`。不改 Controller / VO / 契约 / 前端。
+
+## 提交
+
+1. `test(content): 覆盖免费集数未变但分集漂移的修复场景`
+2. `fix(content): 短剧保存时始终同步分集价格`
diff --git a/docs/plans/PROGRESS.md b/docs/plans/PROGRESS.md
index 843526f..255cfc4 100644
--- a/docs/plans/PROGRESS.md
+++ b/docs/plans/PROGRESS.md
@@ -24633,3 +24633,18 @@ $ git push origin develop
 ```
 
 解读：作者 Zhou Weidong；无 Co-authored-by / AI 痕迹；develop 与 feature 均已 push。未启动/重启 8080/8081。停住等验收。
+
+---
+
+## 2026-10-21 短剧保存始终同步分集价格
+
+计划：`docs/plans/2026-10-21-drama-price-sync-idempotent.md`。
+同值重存也调用 `EpisodePriceSync.syncByDramaRule(drama)`，只更新有差异的分集。
+
+```
+$ mvn -pl fruitshorts-module-content -am test -Dtest=DramaServiceTest -Dsurefire.failIfNoSpecifiedTests=false
+[INFO] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.184 s -- in com.fruitshorts.content.service.DramaServiceTest
+[INFO] BUILD SUCCESS
+```
+
+解读：新增「规则未变但分集漂移」用例；原「已对齐则不写库」仍通过，但会查询分集。
diff --git a/fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/DramaService.java b/fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/DramaService.java
index 8734c64..01f0974 100644
--- a/fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/DramaService.java
+++ b/fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/DramaService.java
@@ -30,7 +30,6 @@ import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.List;
 import java.util.Map;
-import java.util.Objects;
 import java.util.Set;
 
 @Service
@@ -111,8 +110,6 @@ public class DramaService {
     @Transactional(rollbackFor = Exception.class)
     public void update(Long id, DramaSaveReqVO req) {
         Drama drama = getExisting(id);
-        Integer oldFreeEpisodes = drama.getFreeEpisodes();
-        Integer oldUnlockCoin = drama.getUnlockCoin();
         apply(drama, req, false);
         if (req.getFavoriteCount() != null) {
             drama.setFavoriteCount(nonNegative(req.getFavoriteCount(), "收藏数"));
@@ -124,18 +121,7 @@ public class DramaService {
             drama.setViewCount(nonNegative(req.getHeat(), "热度"));
         }
         dramaMapper.updateById(drama);
-        syncEpisodePricesIfNeeded(drama, oldFreeEpisodes, oldUnlockCoin);
-    }
-
-    /** 免费集数或解锁金币变化时，按定价规则回写分集。 */
-    private void syncEpisodePricesIfNeeded(Drama drama, Integer oldFreeEpisodes, Integer oldUnlockCoin) {
-        if (Objects.equals(oldFreeEpisodes, drama.getFreeEpisodes())
-                && Objects.equals(oldUnlockCoin, drama.getUnlockCoin())) {
-            return;
-        }
-        int freeEpisodes = drama.getFreeEpisodes() == null ? 0 : Math.max(0, drama.getFreeEpisodes());
-        int unlockCoin = drama.getUnlockCoin() == null ? 0 : Math.max(0, drama.getUnlockCoin());
-        episodePriceSync.syncByDramaRule(drama.getId(), freeEpisodes, unlockCoin);
+        episodePriceSync.syncByDramaRule(drama);
     }
 
     @Transactional(rollbackFor = Exception.class)
diff --git a/fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/EpisodePriceSync.java b/fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/EpisodePriceSync.java
index 9e2bd1e..48b9aa0 100644
--- a/fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/EpisodePriceSync.java
+++ b/fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/EpisodePriceSync.java
@@ -3,6 +3,7 @@
 package com.fruitshorts.content.service;
 
 import com.baomidou.mybatisplus.core.toolkit.Wrappers;
+import com.fruitshorts.content.dal.entity.Drama;
 import com.fruitshorts.content.dal.entity.DramaEpisode;
 import com.fruitshorts.content.dal.mapper.DramaEpisodeMapper;
 import lombok.RequiredArgsConstructor;
@@ -22,6 +23,17 @@ public class EpisodePriceSync {
 
     private final DramaEpisodeMapper dramaEpisodeMapper;
 
+    /**
+     * 按短剧当前免费集数与解锁金币同步全部分集。
+     *
+     * @return 实际写库的分集数
+     */
+    public int syncByDramaRule(Drama drama) {
+        int freeEpisodes = drama.getFreeEpisodes() == null ? 0 : Math.max(0, drama.getFreeEpisodes());
+        int unlockCoin = drama.getUnlockCoin() == null ? 0 : Math.max(0, drama.getUnlockCoin());
+        return syncByDramaRule(drama.getId(), freeEpisodes, unlockCoin);
+    }
+
     /**
      * 全量同步某剧全部分集价格。
      *