The Delinquent (1974)

Delivery boy Chung rings an order to a local martial arts school He shows that he too is a kung fu student when he punches a bag and also kicks out the instructor for his money Chung has a tough life His father constantly nags him to work hard One day his is heckled by ChienPe a disabled thug who runs a gang Chung fights and beats them up and as a result he is fired from his job Chien turns to his boss Tai Chung to get Chung