Weak Hero (Season 1 & 2)

Yeon Si-eun is a model student who ranks at the top of his high school but appears physically weak and fragile, making him an easy target for school bullies. However, Si-eun refuses to become a victim. By using his high intelligence, analytical psychology, and nearby classroom objects, he fights back against the brutal violence inside and outside of his school, forming a deep bond of friendship and survival with fellow student and fighter Ahn Soo-ho.