Once upon a time, the undercover agent with dragon tattoo Kowloon (Zhang Jin), continually helped the police to solve mysterious cases, which made him known as a rising star. However, his impulsive personality dragged him into endless troubles. He got himself into fights with the Macau detective (Kevin Cheng), as well as an American Army veteran Alexander (Anderson Silva) who has a secret linkage to Kowloon’s background…
