en Cuevana 3. Da-bin, who dreams of a normal high school life, helps his younger sister Eun-seo, who is deaf in one ear, get to and from school every day. When he learns that his family may have to move far away for Eun-seo, he applies for an exchange program, hoping to take one last trip with his girlfriend. But when he starts working at a motel to cover the costs, he finds himself drifting further away from his plan.