Jessica is an ordinary girl who is just finished college, and met her first and last boyfriend, Lee Donghae. They knew each other when they were in middle school. Her and Donghae has been dating since they were in High School and became the cutest couple of the school. Donghae was always caring for Jessica and loved her more than anything else. Jessica also loved him very much and promised herself to never let him go.  But then one day.....everything had changed...Right when Jessica woke up. The whole world was different. She had traveled in time!