PTU: Police Tactical Unit

Although Hong Kong has a very low crime rate in the world, it is not crime-free. Gao Jiasheng is a policeman who works as an undercover agent in a criminal group. In the past few years, he has worked with the boss Tang De. Tang De trusts him very much and recently brought him to the core place. Tang De told him that in the future he will marry his sister Jiajia.