Wretches (2018)

Jae-young is a high school student who is often bullied by the school’s mob leader, Yong-gyu. When Yong-gyu is hospitalized, Hoon wants to take his place at the top of the school. Jae-young hoped doing away with Yong-gyu would help him escape the tedious violence, but he finds himself tormented and harassed even more under the persistent Hoon.

Unfortunately the movie Wretches is not yet available on HBO Max.