Yushu Middle School, a seemingly ordinary but hierarchical school.
At the beginning of the new semester, all students were involved in a mysterious "school experiment."
The school declared -
"In order to develop communication skills and social insight, each student will be randomly assigned to different 'classes'.
You must survive, cooperate, and complete the course within the rules.
Violators will be expelled from school. "
No one knows whether dropping out is actually a punishment.
Because the students who were expelled were never seen again.
Purpose: redemption