What happens when a divorcee with one kid has something going on with you, a classic highschool student? This story is about Stephanie Hwang, who is an optometrist  with a 5 year old boy and you, a typical teenager... How you met and how you'll live.

Tiffany is a johnny-come-lately model, has had many boyfriends, she is a dominant showoff, unlike you who is the exact opposite; a new graduated architectural intern. You two met via Kwon Yuri who is your roommate. She is a player, she brings plenty of girls to your dorm room which can be a pain most of the time.   You (Kim Seon-u):     Tiffany: 

When the mighty singer, Tiffany Young of Girls' Generation decides to make a major change in her life, she moves back to L.A, which would be her hometown. She receives education at Columbia University, where she doesn't expect to meet the love of her life. She'll have to make a choice between her past and future. 

You can't choose what stays and what fades away.