High school and gangs

MC lost his sister because a guy wanted to be noticed by a big gang. MC decides to get rid of all gangsters so he makes a channel where he beats them up live. He has money from who knows where…

I found it a bit boring so I dropped it at chapter 20.

7/10

Gamin Yoon, a 17 year old student, goes to a school known to harbor future criminals. Stuck in a carnivorous environment where only the strongest survive, he struggles to get good grades to enter a 4 year university. But, will he be able to study well enough to enter university, or will he get involved in the unending fights around the school?

Takuma is a badass Omega delinquent more preoccupied with constant fights for his turf than with being cautious and taking his heat suppressing medicines. One day, when he challenges his archrival Hachi, something strange starts to happen with his body!

Na Hwa-jin, a member of the Education Protection Bureau, begins 'true education' to protect the collapsed school authority!

Good grades, a handsome appearance, above-average fighting skills, and a little bit of righteousness. On the eve of his graduation, Kim Hyun-sung gets pushed off a rooftop ends up in a vegetative state. Unable to die, with only his hearing and consciousness alive, he spends the next ten years in hell until he suddenly returns to the day the bullying began.