diff --git a/A00_Common/line_stack_screen.ts b/A00_Common/line_stack_screen.ts
index 8ae8b8bfe..e185ae1ea 100644
--- a/A00_Common/line_stack_screen.ts
+++ b/A00_Common/line_stack_screen.ts
@@ -188,7 +188,7 @@ export function createStackScreen(opt: StackScreenOptions) {
     ctl?.abort();
     ctl = new AbortController();
     const mine = ++seq;
-    void call<{ 연결: DocRecord }>(
+    void call<{ 연결: DocRecord; 사본?: CopyMark }>(
       "/preview",
       cp ? { 문서: doc, 끊음: cut } : { 문서: key ? doc : { ...doc, 키: "_새" }, 입력: usable() },
       ctl.signal,
@@ -197,6 +197,7 @@ export function createStackScreen(opt: StackScreenOptions) {
         if (mine !== seq) return;
         cache.merge(got.연결);
         cache.merge({ 문서: cut });
+        if (got.사본) mark = got.사본; // 새로 읽은 줄 「사본 없는 줄 n」(826-3)
         recalc();
         draw();
       })