Sammy is involved with gangsters to save his relative from a problem so he calls Dragon Hung from America to help him.

A reckless female detective, Xingmin, when investigating a murder case, finds the victim dead naked, hung upside down in the basement bathroom. Old detective Laozhou assures that this is one of the prostitute serial murder cases that he has been after for 15 years. As Xingmin tracks down the murderer, she has to deal with her inner prejudice against prostitutes caused by her traumatizing childhood memory, while irresistibly resonate to the murderer herself. To breakthrough the case, she needs to conquer her nightmare and risk herself to uncover the truth.

Ducky is hired by Rich Chen to transport the "diamonds" he stole from Uncle Pai Mary. Uncles Tough Guy and Mary would like to get the diamond from Ducky, so they volunteer to relieve Ducky of his responsibility.