Rage of the Master (1971)

Tiger Wong (Jimmy Wang Yu) is a student of martial arts who made a promise to his late father never to show his martial arts skills in public. a gang of mercenaries raid a nearby village. The villagers, led by Fong Li, send a party to ask for his help. But Tiger Wong refuses to help or get involved in the trouble. Only after seeing the brutality of the gang does he decide to take some action.