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In a district of Hong Kong, a fight between two gangs leads to the death of a mob boss' son. The father retaliates by ordering a hit on a rival kingpin. The job goes to Lai Fu (Daniel Wu), a novice assassin searching for both money and the missing woman he once loved. When Lai Fu rescues a prostitute (Cecilia Cheung) from an abusive client, she agrees to be his guide in the Mongkok neighborhood of Hong Kong. Meanwhile, the police struggle to stop the hit before it triggers a major gang war. Wikipedia