Snake Deadly Act (1980)

Kwok Chung is a righteous rich kid whose hobby is to fight and brawl. One encounter nearly gets him killed, but he is saved by Yueh (Fong Hak On), the Snake Fist Master. Yueh befriends and teaches Kwok the deadly art of the snake. Soon, Kwok realizes that his teacher has more in common with a snake than just techniques. He's being set up by his teacher, and his family is also targeted for murder!