Watch Fatal Needles vs. Fatal Fists
Two tough cops in China are feared by criminals, but then one of them gets murdered by a bunch of thugs. The dead cop's partner is devastated, leaves the force and becomes a self-pitying drunk. He eventually stumbles into a martial arts school where a white-haired old master teaches him the art of martial arts fighting. Though he still prefers to avoid trouble, the ex-cop finds himself thrust into battling bad guys to protect the people who helped him get his own life back.