Eun Mi, a depressed, cold, lonely girl, loses her memory. She feels like a burden to everyone she knew, but what if one boy can suddenly create a miracle?

It all starts with a daring game in the cafeteria. One loses and is dared to do something that no one would be able to do. Well Park Chanyeol was dared to seduce the innocent, not so attractive Kim Soojung. He has half a year to make her fall deeply in love with him. As time progresses, he finds himself being dragged down in the pit of love as well.

She was in a relationship with another man. He was in a relationship with another woman. But will one big event cause them to get together?