A story within 24 hours. In order to find a missing girlfriend, Laifu (Daniel Wu) emigrates from the mainland to Hong Kong, finds a job in Mong Kok, goes astray and becomes a killer, involved in the bloodshed of the underworld. It was the treacherous Lao Liu who carried him, and he was an informant of the police, who was mixed with black and white, so Laifu embarked on the road of fugitive. In the meantime, he meets a prostitute Dan (Cecilia Cheung), whose similar life experience makes them meet like each other. Dan is determined to help Laifu find his girlfriend and change himself at the same time. The police failed to arrest Laifu many times, and saw that the feud between the rivers and lakes gradually subsided, and they were planning to give up here. Laifu and Dan seemed to be able to catch their breath, but things took an unexpected turn, and Mong Kok surged everywhere at night.
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