Framed for collaborating with Ko, a drug smuggling kingpin, Vietnamese police officer Dang is forced to flee to Hong Kong.

• 越南警官单元忠被诬陷与毒枭密谋犯案，元忠为表清白，立誓缉拿毒枭古浩而前往香港，香港警官狄娜是元忠受训时期的同学，两人情感甚笃。