The Past Haunts

Goo Jun Pyo does not remember Jan Di and Yi Jung rejects Ga Eul, the two girls have gone through too much. They both decide to escape without telling anyone. After 10 years, the girls have become successful. Geum Jan Di is now a successful cardiac surgeon and Ga Eul works as a kindergarden teacher. What will happen when the boys come back? What will happen when the past haunts them?