Kang Joonsang moves to a new high school in search of his biological father. Jeong Yoojin and Kim Sanghyeok are close childhood friends, although Sanghyeok wants to be more than a friend, Yoojin sees him as a brother. On a trip together with other high school mates, Oh Chaerin, Gong Jinsook and Kwon Yonggook, Yoojin is saved after an accident by Joonsang. They become close and she opens up his col...