Kingdom School (2021)

School bullies go above and beyond to be cruel.

Bullies target a female character. School bullies who are sadistic and cruel.

Guy seeks revenge against a sadistic dude who bullied him in high school.

South Korean films that show very real, very violent cases of school bullying that lead the victim to a quest for revenge.

Plots are very similar. Violence and school bullying lead one young man to use his smarts to outwit the bullies and get revenge.