Lee Ha Roo is an 18-year-old, figure skater who moves to Seoul in order to achieve her dream. In Seoul, she meets Shin Hwal, her step-brother after a long time of separation. Originally, their parents had remarried, but when both of them died in a car accident, Ha Roo had been sent to live with her biological father up until now. Hwal works at an advertising company with his friends who are also his roommates, Hae Yoon and Hyun Tae. The three guys accept Ha Roo as one of their roommates as well. Furthermore, Choi Soo In, Ha Roo's figure skating coach, is also Hwal's ex-wife. She tries her best to fix their relationship. In the midst of all this, Ha Roo finds herself developing feelings for her own step-brother.