Liu Chia Liang and Kara Hui Ying Hung star as a traveling stage perfomers in an opera troupe. They wander into a town where a evil rich man (Lo Lieh) falls for his sister and frames him for the rape of his wife, so that his sister will agree to be his concubine (mistress). He takes a mischievous, but kind-hearted street kid (Hsiao Ho) under his wing and teaches him the secrets of "Monkey-boxing".