Do Hyun, the captain of the basketball team, is preparing for the championship. Hye In, the team manager, brings Dong Wook, Do Hyun's first love, to fill in for an injured teammate.

Dong Wook and Do Hyun used to go to the same high school. They spent time together and eventually kissed, but Dong Wook had to transfer schools. They meet again on campus and have to play together in a game. They make a bet that if Dong Wook wins, he can officially join the basketball club. After winning, Dong Wook suggests they live together. Do Hyun is unsure, but Dong Wook can only sleep well when they are together. Will they be able to fix their relationship?