Hsiao Mi and Hsiao Chiun are father and son and their the main villains in Bruce Lee's "The Big Boss".
They run an ice factory that acts as a front for his drug cartel.
When they murdered Cheng Chao-an's (Bruce Lee) family, Cheng Chao-an fought Hsiao Mi's gang and killed them all. During the end, Hsiao and Cheng battle after Hsiao Mi's gang have all been finished by Cheng. After Hsiao throws a knife at Cheng, Cheng dodges the throw and kicks the knife back at Hsiao and Cheng then thrust the knife into his body, therefore killing him, ending their drug ring.