Sung Hyun Ah (The Scarlet Letter, Cello) her lover has never taken a dangerous risk in her life. She has been for seven years and is going to get married next month. One day she meets a handsome stranger, who asked her to spend one day with him. It might be a mistake to accept his proposal, but over the next day she will experience a level of excitement and intimacy, she has never experienced before, and this could change her life all of sudden.