diff --git a/services/insta-render/card_renderer.py b/services/insta-render/card_renderer.py
index 98d059f..d53fc62 100644
--- a/services/insta-render/card_renderer.py
+++ b/services/insta-render/card_renderer.py
@@ -77,11 +77,24 @@ def _env() -> Environment:
     )
 
 
+def _coerce(value, default):
+    """NAS API는 cover_copy/body_copies/cta_copy를 dict/list로 반환하지만
+    구버전 호환을 위해 JSON 문자열도 처리."""
+    if value is None or value == "":
+        return default
+    if isinstance(value, str):
+        try:
+            return json.loads(value)
+        except (ValueError, TypeError):
+            return default
+    return value
+
+
 def _build_pages(slate: dict) -> List[dict]:
     """slate dict → 10 page specs."""
-    cover = json.loads(slate["cover_copy"] or "{}")
-    bodies = json.loads(slate["body_copies"] or "[]")
-    cta = json.loads(slate["cta_copy"] or "{}")
+    cover = _coerce(slate.get("cover_copy"), {})
+    bodies = _coerce(slate.get("body_copies"), [])
+    cta = _coerce(slate.get("cta_copy"), {})
     accent = cover.get("accent_color") or "#0F62FE"
     pages: List[dict] = []
     pages.append({