The Invincible Dragon (Jiulong Bubai)

synopsis

Once upon a time, an undercover agent with a dragon tattoo, Kowloon (Max Zhang), continually helped the police to solve mysterious cases, and he was known as a rising star. However, his impulsive personality caused him endless troubles. He got himself into fights with a Macau detective (Kevin Cheng), as well as an American army veteran, Alexander (Anderson Silva), who has a secret relation to Kowloon's background...