Because of his mother, Xu Ronghe had an engagement with a little boy when he was a child.
Later, the little boy's mother got sick and passed away. His mother was very sad and took him abroad.
A few years later, he returned to China. He transferred to the high school where the boy was, went to the boy's class, and became roommates with the boy.
Xu Ronghe: It's really fate and destiny~
Xuan Lin: Do you regret it?
Xu Ronghe: Do I dare? Can i?
Intention: As a high school student, how can you not study hard?