Dance of the drunk mantis (1979)

A year after training young Wong Fei-hung in the Drunken Fist, Beggar So discovers he has a son, Foggy, whom he attempts to train to no avail. Foggy is then trained in Drunken Fist from his uncle as he must face his father's rival, Rubber Legs, another Drunken Fist master who combines it with Mantis Fist to create a deadly style.