우리들의 일그러진 영웅(1992) / Our Twisted Hero(Ulideul-ui ilgeuleojin yeong-ung)

A transfer student challenges the classroom tyrant who runs his new school through favours, threats and a teacher too lazy to notice, and loses badly enough to become his loyal deputy instead. Decades later, at a funeral, he recognises the same quiet machinery of power still running the room with different faces in charge.

Why it's free: Free on the Korean Film Archive's own channel; Korea's national film archive publishes the films in its collection.