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 read morehis girlfriend LAI CHAN is a SDU member. Conversely, KIN had been kept in the dark until murderers from several fatal cases made him suspicious. Later, YEUNG deliberately gets close to KIN's good friend WONG YUEK LING because of a bribary case. LING eventually found out KIN was the sniper who shot a bullet in her head many years ago and slowly she led the two good brothers into a standoff..