diff --git a/cli/__init__.py b/cli/__init__.py
index 5670638..b492dd1 100644
--- a/cli/__init__.py
+++ b/cli/__init__.py
@@ -189,6 +189,11 @@ def run_streamlit_cli_command(port: int) -> None:
     is_flag=True,
     help="확장된 그래프(프로파일 추출 + 컨텍스트 보강) 사용 여부",
 )
+@click.option(
+    "--use-simplified-graph",
+    is_flag=True,
+    help="단순화된 그래프(QUERY_REFINER 제거) 사용 여부",
+)
 def query_command(
     question: str,
     database_env: str,
@@ -196,6 +201,7 @@ def query_command(
     top_n: int,
     device: str,
     use_enriched_graph: bool,
+    use_simplified_graph: bool,
 ) -> None:
     """
     자연어 질문을 SQL 쿼리로 변환하여 출력하는 명령어입니다.
@@ -227,6 +233,7 @@ def query_command(
             top_n=top_n,
             device=device,
             use_enriched_graph=use_enriched_graph,
+            use_simplified_graph=use_simplified_graph,
         )
 
         # SQL 추출 및 출력
diff --git a/interface/lang2sql.py b/interface/lang2sql.py
index 8293141..9aaa47b 100644
--- a/interface/lang2sql.py
+++ b/interface/lang2sql.py
@@ -20,6 +20,7 @@
 from llm_utils.token_utils import TokenUtils
 from llm_utils.graph_utils.enriched_graph import builder as enriched_builder
 from llm_utils.graph_utils.basic_graph import builder
+from llm_utils.graph_utils.simplified_graph import builder as simplified_builder
 
 
 TITLE = "Lang2SQL"
@@ -71,6 +72,7 @@ def execute_query(
         top_n=top_n,
         device=device,
         use_enriched_graph=st.session_state.get("use_enriched", False),
+        use_simplified_graph=st.session_state.get("use_simplified", False),
         session_state=st.session_state,
     )
 
@@ -219,29 +221,53 @@ def should_show(_key: str) -> bool:
 st.title(TITLE)
 
 # 워크플로우 선택(UI)
+st.sidebar.markdown("### 워크플로우 선택")
 use_enriched = st.sidebar.checkbox(
     "프로파일 추출 & 컨텍스트 보강 워크플로우 사용", value=False
 )
+use_simplified = st.sidebar.checkbox(
+    "단순화된 워크플로우 사용 (QUERY_REFINER 제거)", value=False
+)
 
 # 세션 상태 초기화
 if (
     "graph" not in st.session_state
     or st.session_state.get("use_enriched") != use_enriched
+    or st.session_state.get("use_simplified") != use_simplified
 ):
-    graph_builder = enriched_builder if use_enriched else builder
-    st.session_state["graph"] = graph_builder.compile()
+    # 그래프 선택 로직
+    if use_simplified:
+        graph_builder = simplified_builder
+        graph_type = "단순화된"
+    elif use_enriched:
+        graph_builder = enriched_builder
+        graph_type = "확장된"
+    else:
+        graph_builder = builder
+        graph_type = "기본"
 
-    # 프로파일 추출 & 컨텍스트 보강 그래프
+    st.session_state["graph"] = graph_builder.compile()
     st.session_state["use_enriched"] = use_enriched
-    st.info("Lang2SQL이 성공적으로 시작되었습니다.")
+    st.session_state["use_simplified"] = use_simplified
+    st.info(f"Lang2SQL이 성공적으로 시작되었습니다. ({graph_type} 워크플로우)")
 
 # 새로고침 버튼 추가
 if st.sidebar.button("Lang2SQL 새로고침"):
-    graph_builder = (
-        enriched_builder if st.session_state.get("use_enriched") else builder
-    )
+    # 그래프 선택 로직
+    if st.session_state.get("use_simplified"):
+        graph_builder = simplified_builder
+        graph_type = "단순화된"
+    elif st.session_state.get("use_enriched"):
+        graph_builder = enriched_builder
+        graph_type = "확장된"
+    else:
+        graph_builder = builder
+        graph_type = "기본"
+
     st.session_state["graph"] = graph_builder.compile()
-    st.sidebar.success("Lang2SQL이 성공적으로 새로고침되었습니다.")
+    st.sidebar.success(
+        f"Lang2SQL이 성공적으로 새로고침되었습니다. ({graph_type} 워크플로우)"
+    )
 
 user_query = st.text_area(
     "쿼리를 입력하세요:",
diff --git a/llm_utils/graph_utils/__init__.py b/llm_utils/graph_utils/__init__.py
index 41b539b..794578d 100644
--- a/llm_utils/graph_utils/__init__.py
+++ b/llm_utils/graph_utils/__init__.py
@@ -18,10 +18,12 @@
     query_refiner_with_profile_node,
     context_enrichment_node,
     query_maker_node_with_db_guide,
+    query_maker_node_without_refiner,
 )
 
 from .basic_graph import builder as basic_builder
 from .enriched_graph import builder as enriched_builder
+from .simplified_graph import builder as simplified_builder
 
 __all__ = [
     # 상태 및 노드 식별자
@@ -39,7 +41,9 @@
     "query_refiner_with_profile_node",
     "context_enrichment_node",
     "query_maker_node_with_db_guide",
+    "query_maker_node_without_refiner",
     # 그래프 빌더들
     "basic_builder",
     "enriched_builder",
+    "simplified_builder",
 ]
diff --git a/llm_utils/graph_utils/base.py b/llm_utils/graph_utils/base.py
index d725651..c00c490 100644
--- a/llm_utils/graph_utils/base.py
+++ b/llm_utils/graph_utils/base.py
@@ -140,12 +140,21 @@ def context_enrichment_node(state: QueryMakerState):
     searched_tables = state["searched_tables"]
     searched_tables_json = json.dumps(searched_tables, ensure_ascii=False, indent=2)
 
-    question_profile = state["question_profile"].model_dump()
+    # question_profile이 BaseModel인 경우 model_dump() 사용, dict인 경우 그대로 사용
+    if hasattr(state["question_profile"], "model_dump"):
+        question_profile = state["question_profile"].model_dump()
+    else:
+        question_profile = state["question_profile"]
     question_profile_json = json.dumps(question_profile, ensure_ascii=False, indent=2)
 
+    # refined_input이 없는 경우 초기 사용자 입력 사용
+    refined_question = state.get("refined_input", state["messages"][0].content)
+    if hasattr(refined_question, "content"):
+        refined_question = refined_question.content
+
     enriched_text = query_enrichment_chain.invoke(
         input={
-            "refined_question": state["refined_input"],
+            "refined_question": refined_question,
             "profiles": question_profile_json,
             "related_tables": searched_tables_json,
         }
@@ -207,3 +216,33 @@ def query_maker_node_with_db_guide(state: QueryMakerState):
     state["generated_query"] = res.sql
     state["messages"].append(res.explanation)
     return state
+
+
+# 노드 함수: QUERY_MAKER 노드 (refined_input 없이)
+def query_maker_node_without_refiner(state: QueryMakerState):
+    """
+    refined_input 없이 초기 사용자 입력만을 사용하여 SQL을 생성하는 노드입니다.
+
+    이 노드는 QUERY_REFINER 단계를 건너뛰고, 초기 사용자 입력, 프로파일 정보,
+    컨텍스트 보강 정보를 모두 활용하여 SQL을 생성합니다.
+    """
+    # 컨텍스트 보강된 질문 (refined_input이 없는 경우 초기 입력 사용)
+    enriched_question = state.get("refined_input", state["messages"][0])
+
+    # enriched_question이 AIMessage인 경우 content 추출, 문자열인 경우 그대로 사용
+    if hasattr(enriched_question, "content"):
+        enriched_question_content = enriched_question.content
+    else:
+        enriched_question_content = str(enriched_question)
+
+    res = query_maker_chain.invoke(
+        input={
+            "user_input": [state["messages"][0].content],
+            "refined_input": [enriched_question_content],
+            "searched_tables": [json.dumps(state["searched_tables"])],
+            "user_database_env": [state["user_database_env"]],
+        }
+    )
+    state["generated_query"] = res
+    state["messages"].append(res)
+    return state
diff --git a/llm_utils/graph_utils/simplified_graph.py b/llm_utils/graph_utils/simplified_graph.py
new file mode 100644
index 0000000..a241537
--- /dev/null
+++ b/llm_utils/graph_utils/simplified_graph.py
@@ -0,0 +1,38 @@
+import json
+
+from langgraph.graph import StateGraph, END
+from llm_utils.graph_utils.base import (
+    QueryMakerState,
+    GET_TABLE_INFO,
+    PROFILE_EXTRACTION,
+    CONTEXT_ENRICHMENT,
+    QUERY_MAKER,
+    get_table_info_node,
+    profile_extraction_node,
+    context_enrichment_node,
+    query_maker_node_without_refiner,
+)
+
+"""
+QUERY_REFINER 단계를 제거한 단순화된 워크플로우입니다.
+GET_TABLE_INFO → PROFILE_EXTRACTION → CONTEXT_ENRICHMENT → QUERY_MAKER 순서로 실행됩니다.
+초기 사용자 입력만을 사용하여 더 정확한 쿼리를 생성합니다.
+"""
+
+# StateGraph 생성 및 구성
+builder = StateGraph(QueryMakerState)
+builder.set_entry_point(GET_TABLE_INFO)
+
+# 노드 추가
+builder.add_node(GET_TABLE_INFO, get_table_info_node)
+builder.add_node(PROFILE_EXTRACTION, profile_extraction_node)
+builder.add_node(CONTEXT_ENRICHMENT, context_enrichment_node)
+builder.add_node(QUERY_MAKER, query_maker_node_without_refiner)
+
+# 기본 엣지 설정
+builder.add_edge(GET_TABLE_INFO, PROFILE_EXTRACTION)
+builder.add_edge(PROFILE_EXTRACTION, CONTEXT_ENRICHMENT)
+builder.add_edge(CONTEXT_ENRICHMENT, QUERY_MAKER)
+
+# QUERY_MAKER 노드 후 종료
+builder.add_edge(QUERY_MAKER, END)
diff --git a/llm_utils/query_executor.py b/llm_utils/query_executor.py
index 7a87e3c..68b16bc 100644
--- a/llm_utils/query_executor.py
+++ b/llm_utils/query_executor.py
@@ -12,6 +12,7 @@
 
 from llm_utils.graph_utils.enriched_graph import builder as enriched_builder
 from llm_utils.graph_utils.basic_graph import builder as basic_builder
+from llm_utils.graph_utils.simplified_graph import builder as simplified_builder
 from llm_utils.llm_response_parser import LLMResponseParser
 
 logger = logging.getLogger(__name__)
@@ -25,6 +26,7 @@ def execute_query(
     top_n: int = 5,
     device: str = "cpu",
     use_enriched_graph: bool = False,
+    use_simplified_graph: bool = False,
     session_state: Optional[Union[Dict[str, Any], Any]] = None,
 ) -> Dict[str, Any]:
     """
@@ -52,19 +54,29 @@ def execute_query(
     """
 
     logger.info("Processing query: %s", query)
-    logger.info("Using %s graph", "enriched" if use_enriched_graph else "basic")
+
+    # 그래프 선택
+    if use_simplified_graph:
+        graph_type = "simplified"
+        graph_builder = simplified_builder
+    elif use_enriched_graph:
+        graph_type = "enriched"
+        graph_builder = enriched_builder
+    else:
+        graph_type = "basic"
+        graph_builder = basic_builder
+
+    logger.info("Using %s graph", graph_type)
 
     # 그래프 선택 및 컴파일
     if session_state is not None:
         # Streamlit 환경: 세션 상태에서 그래프 재사용
         graph = session_state.get("graph")
         if graph is None:
-            graph_builder = enriched_builder if use_enriched_graph else basic_builder
             graph = graph_builder.compile()
             session_state["graph"] = graph
     else:
         # CLI 환경: 매번 새로운 그래프 컴파일
-        graph_builder = enriched_builder if use_enriched_graph else basic_builder
         graph = graph_builder.compile()
 
     # 그래프 실행
diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index f72e3f5..0000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,14 +0,0 @@
-[tool.black]
-line-length = 88
-target-version = ['py311']
-include = '\.pyi?$'
-exclude = '''
-(
-    /(
-    \.git
-      | \.venv
-      | build
-      | dist
-    )/
-)
-'''