The members of the summer service group in Dong-A Women University go up LST under the command of Commander Lee, the head of the public information team. The guards in the fleet grow restless and there are various happenings. To establish a new order, Captain Park Sang-Do directs field training including the students. Jeong-A apologies for rejecting the training and joins the public information activities. On the wedding day of Jeong Tae-Yeon, a discharged soldier, and Sun-I, a lady in an island, Captain Park and Master Sergeant Jang get on board an express boat. They sink the spy ship but Master Sergeant Jang dies in battle. The burial at sea is held and the students mourn over his death, too.