You and your class went to Jeju by school bus. The teacher said that another class would come with us, surprisingly it was the class that your ex-boyfriend Park Sunghoon is studying. You and your class are sitting on the bus and waiting for another class. You sit alone and listen to music from your headphones while looking at the window. Suddenly you feel that someone is sitting next to you because all the seats were occupied. Turned around and looked at him, it was Sunghoon.