Lai Kai Keung spins this lighthearted, low-budget Category III period sex comedy that parodies Stephen Chiau's popular Forbidden City Cop. Chinese Secret Agent 000 (Elvis Tsui Kam-kong) has been assigned to investigate the strange goings-on at the Ying Chun brothel. The place is exuding such magnetism on the local men that the birthrate is falling through the floor. Outfitted with the only fountain pen in China, his mission goes swimmingly at first when he gains the confidence of a couple of prostitutes under the guise of being a writer. Yet when his domineering wife gets wind of his doings, she hits the roof, forcing him to shave his head as a sign of adultery and to wear a nightmarish chastity belt which threatens to castrate him when he gets an erection. With scores of naked young lasses writhing around him and a veg-o-matic attached to his genitals, 000's torment is more than he can bear.