One car, tearing down the road like a flash of lightning… The man, Jun Ma, Detective Sergeant, Serious Crimes Unit, like the sports car he controls, Jun is fast precise and brutal - harnessing a horse power that fears to be unleashed. Jun detests crime and his lifelong nemeses are a triad gang of three brothers - eldest brother Archer, the bully; second brother Tony, the cool calculator; youngest brother Tiger, the fighter. Their skills have seen them grow steadily in the criminal world. In order to further infiltrate the gang and fight them from within, Jun has planted a mole, Wilson, who has managed to gain the complete trust of the gang and has become their personal bodyguard. Over the years Wilson has become unhappy with Jun's impulsive and unruly style. Their disagreements in their way of working have led to constant arguments and altercations. In a heated battle between Jun and the Triad gang, Wilson's dual role is exposed and he almost gets killed. Finally, Jun intercepts Archer and arrests him and manages to force Tony and Tiger out of business. The cost is Wilson's left leg, leaving him handicapped for life. The final showdown between Jun and Tony begins!