Rules Are Coming, I Am Trying to Survive in a Kindergarten

When Lin Qing went back to school to get his diploma, global rules came to Blue Star. He was trapped in school and played with the rules to survive. But... Is this really a school and not a funeral site? Why wear mourning clothes? There is also this weird Yinle bell, the teaching corpse, and the square "dormitory"... Which school is so hellish? ! This is definitely not my school!