Eunseo Lee and Sihwa Kang have been friends all their lives. One day, Eunseo shatters their comfortable relationship by asking Sihwa out, and Sihwa moves away soon afterward. Eunseo tries her best to forget him until they meet in a college class six years later. He seems to know about her unrequited love for him, and to make matters worse, he moves in with her family after running away from his hostile home environment. Can Eunseo cope with his sudden reappearance in her life? And is it possible that Sihwa loves her back?