Two boys who are pretty hot fu fighters take the oath as brothers by inscribing domino tattooes on their forearms. The scene then dissolves into the credits, full of visuals featuring dominoes and gambling, with the theme from Hawaii-5-0 blasting out !
Ten years pass, and the young men meet again. But this time, they are on opposite sides of the law. Lo Tien Hao is the son of a government anti-vice detective, and Lung Shih Chieh the son of a casino owner who is in league with Ma Piao, a crime lord.
Young Lung is disturbed when his father finally admits crime connections. Will he side with his brother, or his adopted father ?