Pre-1997, a hero's story. Detective Sergeant Jun Ma's lifelong nemeses are a triad gang of three brothers. In order to fight them from within, Jun has planted a mole, Wilson, who has managed to gain the complete trust of the gang. But over the years Wilson has become more and more unhappy with Jun's impulsive and unruly style. In a heated battle Wilson's dual role is exposed and one of the gang members is arrested. In order to escape any convictions, other gang memebers decide to destroy all the evidence and kill all witnesses to their crimes, including Wilson. Jun would pay any price to save his partner...