"Bullet" and "Brain" were two legendary figures in a sinful city - Bullet was a sharp shooter while Brain was famous for his ingenious plots and the countless electronic gadgets he was equipped with. Nine years ago, they disappeared after one vowing never to puck up his gun and the other never to tell a lie! Then out of the blue, they returned to the city to protect Rain (Tang Yan), the granddaughter of "The Principal", the most powerful mafia boss of the city. The Principal had been murdered by his right hand man, Winston. As Winston was unable to get his money in the Swiss bank account, he came for Rain! Policeman Fred (Alex Fong) took Rain to a safe house and they were eventually saved by Bullet and Brain. Bullet met a beautiful dancer named May, who looked like his former lover. Brain met a fragile young woman who called Dime, and who claimed to be the little girl he rescued nine years ago. These two women set up Bullet and Brain while Winston kidnapped Rain. Bullet, Brain, and Fred then barged into Winston's lair - could they turn the table on Winston?