Xia Cha lives with his grandson, who has a crush on his neighbor and classmate. Two family members get into an argument and fall down the stairs. When Xia Cha wakes up, he is in his grandson’s body, and has to go to university in his stead. Unexpectedly, he and his grandson end up kissing.

Hsia Cha realizes that his soul is in his grandson’s body, and tries to set things right. Haiyuan soon notices the change, and agrees to help retrieve Zefang’s soul. Hsia Cha tries to adapt to school life, but after his original body gets cremated, he realizes he has no way back.