Update app.py

app.py

@@ -14,19 +14,27 @@ api_key = st.text_input("🔑 Upstage API Key (starts with 'up_')", type="passwo
 user_input = st.text_input("💬 Your Message", "")
 
 st.markdown("### 🧠 Custom System Prompt")
-custom_prompt = st.text_area("사용자 정의 시스템 프롬프트", "You are a helpful assistant.", height=100)
+st.markdown("""
+**What is a System Prompt?**  
+A system prompt is a special instruction given to the AI before the conversation begins.  
+It tells the AI how it should behave — like setting the tone, role, or personality.  
+For example, you can ask it to be a polite assistant, a creative writer, or a strict grammar checker.  
+Changing the system prompt can lead to very different responses, even if the user's question stays the same.
+""")
 
-# --- Default prompt 설정 ---
+custom_prompt = st.text_area("✏️ Write your own system prompt below:", "You are a helpful assistant.", height=100)
+
+# --- Default prompt setting ---
 default_prompt = "You are a helpful assistant."
 
-# --- 세션 초기화 ---
+# --- Session Reset ---
 if "default_messages" not in st.session_state:
     st.session_state.default_messages = [{"role": "system", "content": default_prompt}]
 if "custom_messages" not in st.session_state or st.session_state.custom_prompt != custom_prompt:
     st.session_state.custom_messages = [{"role": "system", "content": custom_prompt}]
     st.session_state.custom_prompt = custom_prompt
 
-# --- Solar Pro API 호출 함수 ---
+# --- Solar Pro API call ---
 def solar_pro_chat(messages, api_key):
     url = "https://api.upstage.ai/v1/chat/completions"
     headers = {
@@ -51,15 +59,15 @@ def solar_pro_chat(messages, api_key):
                 content = json.loads(event.data)["choices"][0]["delta"].get("content", "")
                 yield content
             except Exception as e:
-                st.error("⚠️ 응답 처리 중 오류가 발생했습니다.")
-                print(f"[SSE 파싱 오류] {e}")
+                st.error("⚠️ An error occurred while processing the response.")
+                print(f"[SSE parsing error] {e}")
                 continue
     except requests.exceptions.RequestException as e:
-        st.error("❌ API 호출 실패: API 키 또는 네트워크 상태 확인")
-        print(f"[API 요청 오류] {e}")
+        st.error("❌ API call failed: Check your API key or network status")
+        print(f"[API request error] {e}")
         return
 
-# --- 비교용 응답 처리 ---
+# --- Response processing for comparison ---
 if st.button("🚀 Compare Responses") and api_key and user_input:
     st.session_state.default_messages.append({"role": "user", "content": user_input})
     st.session_state.custom_messages.append({"role": "user", "content": user_input})
@@ -70,7 +78,7 @@ if st.button("🚀 Compare Responses") and api_key and user_input:
         st.subheader("🔹 Default Prompt")
         default_response = ""
         default_area = st.empty()
-        with st.spinner("Default 응답 생성 중..."):
+        with st.spinner("Generating default response..."):
             for chunk in solar_pro_chat(st.session_state.default_messages, api_key):
                 default_response += chunk
                 default_area.markdown(f"**🤖 Bot:** {default_response}")
@@ -80,13 +88,13 @@ if st.button("🚀 Compare Responses") and api_key and user_input:
         st.subheader("🔸 Custom Prompt")
         custom_response = ""
         custom_area = st.empty()
-        with st.spinner("Custom 응답 생성 중..."):
+        with st.spinner("Generating custom response..."):
             for chunk in solar_pro_chat(st.session_state.custom_messages, api_key):
                 custom_response += chunk
                 custom_area.markdown(f"**🤖 Bot:** {custom_response}")
         st.session_state.custom_messages.append({"role": "assistant", "content": custom_response})
 
-# --- 채팅 히스토리 다운로드 ---
+# --- Download chat history ---
 def generate_csv(messages, prompt_label):
     rows = [{"role": "system", "content": prompt_label}]
     for msg in messages: