Gong Wei (played by Jet Li), an undercover police officer from the mainland, cannot give more care to his seriously ill wife or his sensible and martial arts-skilled son Gong Gu (played by Xie Miao) due to work. When his wife and children urgently need him, Gong Wei, under the order of his superior, pretends to be a criminal and escapes with Xiao Hei (played by Ke Shouliang), a Hong Kong gangster captured by the mainland, and embarks on a journey to Hong Kong to be an undercover in the Fu Guang (played by Yu Rongguang) gang. Gong Wei and the Fu Guang gang robbed each other in the bomb deal, and rescued Hong Kong Inspector Fang Yihua (played by Anita Mui) in the melee, and gained Fu Guang's trust with his outstanding skills. Fang Yihua came to Beijing to investigate Gong Wei's identity and learned the truth. After Gong's wife died, she led Gong Gu to Hong Kong to find his father. Fang Yihua's boss exposed Gong Wei and Gong Gu's father and son, putting Gong Wei in danger, and at this moment, the auction robbery planned by Fu Guang was imminent...