THE STREET CAR NAMED DESIRE, with Lawrence Ng Kai-wah, Bonnie Fu Kok-ching, Wong Wai and Kong Wah. Directed by Cheung Kin. On Mandarin circuit. WHY this tawdry affair is called The Street Car Named Desire is as big a mystery as its Chinese title, Sunset Carmen. The appellation may be the most creative aspect of this gangster romance, a slipshod affair which elicited a desire by a midnight preview audience to beat a hasty retreat. Wah (Lawrence Ng) is a triad boss recently released from prison who discovers his rank in the underworld society has fallen considerably. He takes a job smuggling Chinese fugitives from Shenzhen into Hongkong, and his first and only customer is a renegade policewoman, Ling (Wong Wai). At first glance she seems rather prim and proper, but the film-makers see to it her ample bust is given due prominence. Despite their initial antagonism, Wah and Ling engage in a torrid affair that turns into an age-old story: she is head-over-heels in love, but to him it is a one-night stand. He is infatuated with Amy (Bonnie Fu), a devil woman who toys with his affections in order to incite the jealousy of her triad boyfriend, Chau (Kong Wah). Chau, meanwhile, is busy with a new girlfriend. Despite their supposed ill-gotten wealth, she is always dressed in the same black lace bra and panties. The plot is not as predictable as it sounds, peppered with illogical instances and scenes that do not make sense. Prominent among these is a sequence where Ling gives a mainland Chinese smuggler - a man she barely knows - a Swiss bank account valued at US$500,000 with the admonition he give up his life of crime.