diff --git a/bot bond sell.py b/bot bond sell.py
index b9adc7d..9b74047 100644
--- a/bot bond sell.py	
+++ b/bot bond sell.py	
@@ -52,6 +52,7 @@ def main():
     position = 0            # 현재 BOND 포지션
     order_id = 0            # 단조 증가하는 주문 ID
     active_orders = {}      # {order_id: {"dir": ..., "price": ...}}
+    market_open = False     # 시장 open 여부 (open 전에는 주문 불가)
 
     def next_id():
         nonlocal order_id
@@ -66,6 +67,9 @@ def main():
 
     def place_bond_orders():
         """포지션 한도 안에서 bid/ask 양방향 주문"""
+        if not market_open:
+            return
+
         cancel_all_bond_orders()
 
         buy_price  = FAIR_VALUE - SPREAD   # 999
@@ -88,9 +92,6 @@ def main():
             )
             active_orders[ask] = {"dir": Dir.SELL, "price": sell_price}
 
-    # 시작 시 첫 BOND 주문 배치
-    place_bond_orders()
-
     # Set up some variables to track the bid and ask price of a symbol. Right
     # now this doesn't track much information, but it's enough to get a sense
     # of the VALE market.
@@ -124,9 +125,10 @@ def main():
             print("The round has ended")
             break
         elif message["type"] == "open":
-             print("Market opened:", message)
-             market_open = True
-             place_bond_orders()  # open 받은 후에만 주문
+            # 시장이 열렸을 때 주문 시작 (open 전에 주문하면 reject됨)
+            print("Market opened:", message)
+            market_open = True
+            place_bond_orders()
         elif message["type"] == "error":
             print(message)
         elif message["type"] == "reject":
@@ -207,15 +209,15 @@ class ExchangeConnection:
     ):
         """Add a new order"""
         self._write_message(
-        {
-            "type": "add",
-            "order_id": order_id,
-            "symbol": symbol,
-            "dir": dir,
-            "price": price,
-            "size": size,
-            "tif" : "GFD",  # Good-For-Day (주문이 체결되거나 취소될 때까지 유효) 
-        }
+            {
+                "type": "add",
+                "order_id": order_id,
+                "symbol": symbol,
+                "dir": dir,
+                "price": price,
+                "size": size,
+                "tif": "DAY",  # 설명서 필수 필드: DAY or IOC
+            }
         )
 
     def send_convert_message(self, order_id: int, symbol: str, dir: Dir, size: int):