The power of evil invades Blue Star, reducing human mathematical IQ by a million times. Evil beasts become overlords, and humankind is in danger.
A certain high school
Teacher: 9+9=?
Students: It's too difficult, I can't do it at all.
It happened that Huang Fan was traveling through this place at this time.
Huang Fan: I want to revive mankind and study.
Very beautiful, wonderful work by a master