diff --git a/app/api/study_question_progress.py b/app/api/study_question_progress.py
index b349ebe..0849d3c 100644
--- a/app/api/study_question_progress.py
+++ b/app/api/study_question_progress.py
@@ -102,6 +102,9 @@ class ReviewQueueResponse(BaseModel):
     items: list[ReviewQueueItem]
     page: int
     page_size: int
+    # Phase 2-F: due_today 탭에서만 채움. due_at < today 0시 (UTC) + stage < 4.
+    # UI 가 "정체 N건" 경고 + [정리] 버튼 노출 판단에 사용.
+    overdue_count: int = 0
 
 
 def _truncate(text: str, n: int = 80) -> str:
@@ -210,8 +213,99 @@ async def review_queue(
         for (p, q) in rows
     ]
 
+    # Phase 2-F: due_today 탭일 때 overdue 카운트 (오늘 0시 UTC 이전 due) — UI 경고 노출용
+    overdue_count = 0
+    if tab == "due_today":
+        today_start = now.replace(hour=0, minute=0, second=0, microsecond=0)
+        overdue_row = await session.execute(
+            select(func.count())
+            .select_from(StudyQuestionProgress)
+            .where(
+                StudyQuestionProgress.user_id == user.id,
+                StudyQuestionProgress.study_topic_id == topic_id,
+                StudyQuestionProgress.due_at.is_not(None),
+                StudyQuestionProgress.due_at < today_start,
+                or_(
+                    StudyQuestionProgress.review_stage.is_(None),
+                    StudyQuestionProgress.review_stage < 4,
+                ),
+            )
+        )
+        overdue_count = int(overdue_row.scalar() or 0)
+
     return ReviewQueueResponse(
         tab=tab, total=total, items=items, page=page, page_size=page_size,
+        overdue_count=overdue_count,
+    )
+
+
+# ─── redistribute (Phase 2-F due_at 정체 정리) ───
+
+
+class RedistributeRequest(BaseModel):
+    spread_days: int = 7  # 1~14 일 사이. default 7.
+
+
+class RedistributeResponse(BaseModel):
+    redistributed_count: int
+    spread_days: int
+
+
+@router.post(
+    "/{topic_id}/review-queue/redistribute", response_model=RedistributeResponse
+)
+async def redistribute_overdue(
+    topic_id: int,
+    body: RedistributeRequest,
+    user: Annotated[User, Depends(get_current_user)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+):
+    """overdue (due_at < today 0시 UTC + stage < 4) 를 내일~spread_days 일에 round-robin 분산.
+
+    동작:
+      - 오늘 0시 이전에 due 된 항목 모두 fetch (오래된 순)
+      - i % spread_days + 1 일 후 자정 + i*7분 (분산용 분단위) 로 due_at 갱신
+      - review_stage 는 건드리지 않음 (정체 처리는 시간 재배치만)
+    """
+    if not (1 <= body.spread_days <= 14):
+        raise HTTPException(status_code=400, detail="spread_days 는 1~14 사이여야 합니다")
+
+    topic = await session.get(StudyTopic, topic_id)
+    _verify_topic_owner(topic, user)
+
+    now = datetime.now(timezone.utc)
+    today_start = now.replace(hour=0, minute=0, second=0, microsecond=0)
+
+    overdue = (
+        await session.execute(
+            select(StudyQuestionProgress)
+            .where(
+                StudyQuestionProgress.user_id == user.id,
+                StudyQuestionProgress.study_topic_id == topic_id,
+                StudyQuestionProgress.due_at.is_not(None),
+                StudyQuestionProgress.due_at < today_start,
+                or_(
+                    StudyQuestionProgress.review_stage.is_(None),
+                    StudyQuestionProgress.review_stage < 4,
+                ),
+            )
+            .order_by(StudyQuestionProgress.due_at.asc())
+        )
+    ).scalars().all()
+
+    if not overdue:
+        return RedistributeResponse(redistributed_count=0, spread_days=body.spread_days)
+
+    base_day = today_start  # 오늘 0시 기준 — +1일부터 분산
+    for i, p in enumerate(overdue):
+        days_offset = (i % body.spread_days) + 1
+        # 같은 날 안에서도 분산하려고 i*7분 추가 (200건 까지 24시간 안에 겹침 없이 spread)
+        minute_offset = (i * 7) % (24 * 60)
+        p.due_at = base_day + timedelta(days=days_offset, minutes=minute_offset)
+
+    await session.commit()
+    return RedistributeResponse(
+        redistributed_count=len(overdue), spread_days=body.spread_days
     )
 
 
diff --git a/frontend/src/routes/study/topics/[id]/review-queue/+page.svelte b/frontend/src/routes/study/topics/[id]/review-queue/+page.svelte
index adced28..3de59ae 100644
--- a/frontend/src/routes/study/topics/[id]/review-queue/+page.svelte
+++ b/frontend/src/routes/study/topics/[id]/review-queue/+page.svelte
@@ -41,10 +41,12 @@
   let items = $state([]);
   let loading = $state(false);
   let counts = $state({}); // { tab: total }
+  let overdueCount = $state(0);
 
   // 멀티 셀렉트 (현재 페이지 보이는 카드 기준 선택. 페이지 이동 시 유지).
   let selected = $state(new Set()); // Set<number> — question_id
   let starting = $state(false);
+  let redistributing = $state(false);
 
   async function loadTopic() {
     try {
@@ -75,15 +77,38 @@
       );
       total = r?.total ?? 0;
       items = r?.items ?? [];
+      overdueCount = r?.overdue_count ?? 0;
     } catch (err) {
       addToast('error', err?.detail || '복습함 조회 실패');
       total = 0;
       items = [];
+      overdueCount = 0;
     } finally {
       loading = false;
     }
   }
 
+  async function redistributeOverdue() {
+    if (overdueCount === 0 || redistributing) return;
+    if (!confirm(
+      `정체된 복습 ${overdueCount}건을 1~7일에 걸쳐 균등 분산합니다. 학습 단계는 그대로 유지됩니다. 진행할까요?`,
+    )) return;
+    redistributing = true;
+    try {
+      const res = await api(`/study-topics/${topicId}/review-queue/redistribute`, {
+        method: 'POST',
+        body: JSON.stringify({ spread_days: 7 }),
+      });
+      addToast('success', `${res.redistributed_count}건을 ${res.spread_days}일에 분산했습니다`);
+      // 카운트 + 목록 새로고침
+      await Promise.all([loadCounts(), loadTab()]);
+    } catch (err) {
+      addToast('error', err?.detail || '정리 실패');
+    } finally {
+      redistributing = false;
+    }
+  }
+
   function setTab(key) {
     if (activeTab === key) return;
     activeTab = key;
@@ -247,6 +272,18 @@
       <div class="p-5 flex flex-col gap-4">
         <h1 class="text-base font-semibold text-text">복습함</h1>
 
+        <!-- Phase 2-F: due_today 탭에서만 정체 경고 + 정리 버튼 -->
+        {#if activeTab === 'due_today' && overdueCount > 0}
+          <div class="rounded border border-warning/40 bg-warning/5 p-3 text-xs text-text flex items-center gap-3 flex-wrap">
+            <AlertCircle size={14} class="text-warning shrink-0" />
+            <div class="flex-1 min-w-0">
+              <div>오늘 할 일 중 <span class="text-warning font-medium">{overdueCount}건</span>이 어제 이전부터 정체된 복습입니다.</div>
+              <div class="text-dim mt-0.5">1~7일에 균등 분산해서 페이스를 회복할 수 있습니다.</div>
+            </div>
+            <Button size="sm" variant="ghost" loading={redistributing} onclick={redistributeOverdue}>정리</Button>
+          </div>
+        {/if}
+
         <!-- 탭 -->
         <div class="flex flex-wrap gap-1 border-b border-default">
           {#each TABS as t}