An illegal immigrant from Mainland China sneaks into the corrupt British-colonized Hong Kong in 1963, transforming himself into a ruthless drug lord.

Based on real-life crimes that terrorized Hong Kong in the 1990s, Logan (Tony Leung Ka-Fai) is the head of leading a notorious human trafficking gang, abducting the children of Hong Kong's elite. Police forces decide to send in Sky (Louis Koo), a Hong Kong undercover agent whose mission is to infiltrate and save the hostages, all while bringing the gang and their leader to justice.

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The film tells the story of the fearless and determined Wu Guohao and his childhood friends, Big Wei and Little Wei, who smuggle themselves from Guangdong to Hong Kong in search of a better life. They gain the favor of the shrewd and meticulous Inspector Xu Le and eventually rise to dominate both the criminal and law enforcement worlds in Hong Kong. Xu Le initially joined the police force as an idealistic young man, aspiring to serve the people and uphold justice, only to discover that the entire system was deeply corrupt.