Moonbyul and Yongsun was a happy loving couple but everything change after Moonbyul decided to follow her parent order to stay in America for a few years and Yongsun got into a accident and lost her memories.
As kids Byul had like Yongsun, she waited and waited but when the time comes she has to leave that's when she had courage to tell her what she feels. Years had passed but after the tragic accident that befalls on Byul this made their lives collide again. The world gave them a second chance, would they move on or chase the past?