Engi's troubled life in a boarding house began with three women: a sexy boarding house owner, her sexier daughter, and his innocent first love. When freshman Eun gi came to Seoul to study, he found a new accommodation in a boarding apartment run by his mother and daughter. His only pleasure is playing this self-evident push pull relationship with his mother or daughter. One day, his first love, innocent and kind Shunyi, suddenly came to the boarding house to visit him. The sleepless night of 20-year-old virgin Eun gi has begun, with the sexy daughter of the boarding apartment behind the door and the curvaceous hostess in the bathroom next to the room.