Before the accident, Chanbi had mutual feelings for her classmate Kang Gyeon-oh and was often the one to take the initiative in getting close to him. However, after getting into an accident, she lost all her memories from the past year, including her affection for Gyeon-oh, and no longer sees him as someone special. The story revolves around Gyeon-oh's efforts to make her fall in love with him again, while also questioning the true nature of their past relationship.