Min Jung and Young Mi is bestfriend since childhood. They were really close. Until they decide to move school together. When th-ey were in the new school, many things happen. Min Jung also didnt know that in that school there is her old bestfriend, Byun Baekhyun who studied there too after a long time being apart. In the same time, Kai, who show interest in Young Mi and make her his girlfriend. But no one know that actually he is doing this just for a 'dare'. As the time goes by, they know each other and become really close and theres a lot of challenge and hard time they been through..