The Underground Banker is another CAT III (Categoy III) movie, when a movie is rated CAT III by the Hong Kong film censor, you would expect excessive sexual content (mostly rape) and extreme violence.
The Underground Banker is about a trucker named Ming (sometimes nicknamed as Marshmallow), Ming finally succeeded in finding a new house for his family, but there are 3 things that are affecting his life: 1) he suffers from sexual impotency 2) his son became a close friend of the Serial killer "Dr Lamb" (it's from the CAT III movie of the same name, unfortunately Dr Lamb is not played by Simon Yam, but Lawrence Ng did a good job), now Dr Lamb, is not interested in killing anymore, he found redemption in Buddha. 3) after that Ming's wife played on the Hong Kong stock market, she lost a lot of money and after asking help for a friend called Canner (it was even a ex-crush, if i remember correctly), Canner introduce to Ming's wife his brother, who is a loan shark (played by William Ho, you will probably remember him for having played many villains in other CAT III movies, like Daughter of Darkness), Ming's wife decides to lend some money from the Loan Shark, but for pay the debt she is forced to become a whore.....
For make this movie enjoyable there is: a good amount of nudity and sex, also some (typical) funny subtitles, with grammar errors and mistranslated words or slang, the violence is not gory, but it didn't "ruined" the film for me. Check it out CAT III fans !