Sniper Lee Ho Yeung left the Special Duties Unit because of one mistake and gradually turned hostile to his colleague and good friend Ko Chun Kin. Thereafter, Yeung got into the yacht business and became the president of a gun club, but was actually working with the triad underground. He took advantage of OCTB senior inspector Seung Koon Ming Chu's trust to get information on the police operations against the triad, and
