Fourier broke his promise.
He didn't come to Lin Shujin's 18th birthday.
He missed her bar mitzvah.
Instructions for entering the pit:
-The age difference between the male protagonist and the female protagonist is 3 years.
-The male protagonist is neither a transfer student nor a repeater. He was kicked out by his father to serve as an intern for one year.
Concept: It's not easy to be a teacher.