Seonu transferred to a new school after a horrible experience at his last one. All he wants now is a peaceful life. However, he ends up meeting Sion and his friends, who seem like bad news. At first, Seonu tries to avoid them, but Sion is insistent on becoming friends. Sion, however, is not a normal friend—he quickly becomes obsessive, touchy, and manipulative. What should Seonu do about him?