Senior Superintendent Luo Congtian from Hong Kong violated the anti-corruption ordinance and was forced to flee to the United States. His son, Robin, obtained a gang roster in Hong Kong and rushed to the U.S. to hand it over to Congtian, hoping to clear his father's name from corruption charges. Gang assassins Ya Jian and Xiao Wen traced him to the U.S. The 'Flower Destroyer' Devil Fish committed numerous crimes, harming young women. Robin's brother, Michael, and the sister of the street queen, Big Sister, fell victim together. Robin and Big Sister vowed to uncover the murderer. Ya Jian and Xiao Wen colluded with American gangs to assassinate Congtian, but the roster went missing. While pursuing Devil Fish, Robin was also hunted by Ya Jian's group. In a critical moment, he met Congtian's adopted daughter, Shanshan, who revealed that she was keeping the roster. With the cooperation of the police, Robin and Big Sister eliminated Devil Fish, and Ya Jian's group was brought to justice. In the end, Robin carried the roster and set off on his journey alone...