Evil Cat (1987)

Every 50 years a cat demon has to be killed by a Cheung family member until the body-hopping feline demon's 9 lives are up. This time it falls on the shoulders of Master Cheung. He is afraid of cancer killing him before he can stop the demonic force, so when Long comes to him after his boss gets possessed, he tries teaching him his family's Mao Shan magic hoping to pass it onto him since Cheung's bloodline stops with himself.