diff --git a/B01_Dashboard/B01_Dashboard_Knowledge_Chat.py b/B01_Dashboard/B01_Dashboard_Knowledge_Chat.py
index cea3a1c2a..d9b0a0477 100644
--- a/B01_Dashboard/B01_Dashboard_Knowledge_Chat.py
+++ b/B01_Dashboard/B01_Dashboard_Knowledge_Chat.py
@@ -17,7 +17,7 @@ from common_util.common_util_auth import verify_session
 
 router = APIRouter(prefix="/knowledge-chat", tags=["B01_KnowledgeChat"])
 KNOWLEDGE = Path(__file__).resolve().parents[1] / "resources" / "knowledge"
-EXCLUDED = ("실무문서", "stmate", "다산소프트", "technical_info")
+EXCLUDED = ("실무문서", "stmate", "다산소프트")
 MODEL = "gemini-3.8-flash"
 logger = logging.getLogger(__name__)
 
@@ -27,17 +27,18 @@ class ChatRequest(BaseModel):
 
 
 def _allowed(path: Path) -> bool:
-    return path.suffix.lower() == ".md" and not any(
-        excluded in part.casefold()
-        for part in path.relative_to(KNOWLEDGE).parts
-        for excluded in EXCLUDED
+    original = KNOWLEDGE / "original"
+    return (
+        path.suffix.lower() == ".md"
+        and path.resolve().is_relative_to(original.resolve())
+        and not any(part.casefold() in EXCLUDED for part in path.relative_to(original).parts[:-1])
     )
 
 
 @lru_cache(maxsize=1)
 def _sections() -> list[tuple[str, str]]:
     sections = []
-    for path in KNOWLEDGE.rglob("*.md"):
+    for path in (KNOWLEDGE / "original").rglob("*.md"):
         if not _allowed(path):
             continue
         relative = path.relative_to(KNOWLEDGE).as_posix()
diff --git a/resources/tester/test_b01_knowledge_chat.py b/resources/tester/test_b01_knowledge_chat.py
index be1d819c6..9f566b925 100644
--- a/resources/tester/test_b01_knowledge_chat.py
+++ b/resources/tester/test_b01_knowledge_chat.py
@@ -93,19 +93,22 @@ def test_gemini_timeout_is_reported(monkeypatch):
     assert "시간 초과" in error.value.detail
 
 
-def test_chat_searches_all_knowledge_markdown_except_excluded_folders(monkeypatch, tmp_path):
+def test_chat_reads_only_original_except_excluded_folders(monkeypatch, tmp_path):
     public = tmp_path / "original" / "법률"
     guide = tmp_path / "technical_info"
+    outside = tmp_path / "별도자료"
     private = tmp_path / "original" / "실무문서"
     stmate = tmp_path / "original" / "원가계산" / "STmate"
     dasan = tmp_path / "original" / "원가계산" / "다산소프트"
     public.mkdir(parents=True)
     guide.mkdir()
+    outside.mkdir()
     private.mkdir()
     stmate.mkdir(parents=True)
     dasan.mkdir()
     (public / "현행.md").write_text("# 임도 기준\n" + "임도 설치 기준 내용 " * 10, encoding="utf-8")
     (guide / "_검토.md").write_text("# 임도 기준\n기술정보 안내 " * 10, encoding="utf-8")
+    (outside / "자료.md").write_text("# 임도 기준\n별도 자료 " * 10, encoding="utf-8")
     (private / "사례.md").write_text("# 임도 기준\n비공개 사례 " * 10, encoding="utf-8")
     (stmate / "자료.md").write_text("# 임도 기준\nSTmate 자료 " * 10, encoding="utf-8")
     (dasan / "자료.md").write_text("# 임도 기준\n다산소프트 자료 " * 10, encoding="utf-8")
@@ -149,4 +152,5 @@ def test_chat_searches_all_knowledge_markdown_except_excluded_folders(monkeypatc
     assert "STmate" not in sent["prompt"]
     assert "다산소프트" not in sent["prompt"]
     assert "기술정보 안내" not in sent["prompt"]
+    assert "별도 자료" not in sent["prompt"]
     chat._sections.cache_clear()