Ever since his eighth birthday, Yeonwoo has been the target of cruel bullying by his classmates. It was a well-known fact that he was poor, smelly, and living with his grandma. But with the new transfer student Seongwoon's dramatic appearance, he gains his first real friend. Just as Yeonwoo starts getting used to his new happy life, Seongwoon and his parents are in a tragic accident that leaves him orphaned with no memories. Now, it's Yeonwoo's turn to take care of the precious person who gifted him so many of his "firsts"even if Seongwoon doesn't remember a single one.