Choi Yoo Jin is a pretty, sweet and caring girl who loves his boyfriend Myungsoo very much. However, her parents decided that she and Minho will migrate to the US and continue their studies there. Yoo Jin didn't want to leave him but she can't do anything except for leaving him with ONLY a letter. But an accident happens, erasing all the memories from childhood to the present in Yoo Jin's brain. But what if a g