Park Hana, a normal eighteen year-old who lives with her parents and little sister in downtown Seoul, has always dreamt of being a singer. Unfortunately her dream seems unreachable seeing as her family aren’t rich enough to send her to a proper singing school.

Kim Seoyeon, also eighteen and the only child of a rich business man, is studying dance at SM high. The best performing arts school in the whole of Korea. She has no particular dream, since everything she has ever wanted has been provided for her since she was young, leading her to be a perfect picture of what a lot of people would call a ‘brat’.

At first glance Hana and Seoyeon have nothing in common, apart from their ages…but on a dull Friday afternoon, all that is about to change with the help of a very strange fortune cookie.

The unthinkable happens, Hana and Seoyeon exchange bodies. Hanna is suddenly thrown into a world full of obnoxious idols, money, fame and fashion while Seoyeon gets to experience first-hand that not everyone was born as lucky as her.

The girls who used to be complete strangers, must now join forces in order to put things back to the way they should be. But that can only be achieved if Hana, in Seoyeon’s body, manages to get Luhan, Seoyeon’s ex-boyfriend whom she cheated on, to full in love with her in less than two months.

What will happen? Can the girls put aside their major differences to succeed or are they doomed to stay in the other’s messed up life for good?