Yang Yu Ri's mother remarries and moves into her new father's mansion, but she feels uncomfortable there. One day, when her mother is away on a business trip for two days, Yang Yu Ri decides to stay with her boyfriend. Her stepfather agrees, but she comes home in the middle of the night because she misses him. To relieve her stress, Yang Yu Ri starts drinking with her stepfather, but suddenly becomes sleepy and loses consciousness. Then...