One Nite in Mongkok (2004)

A story in 24 hours. In order to find his missing girlfriend, Laifu (played by Daniel Wu) immigrated to Hong Kong from the mainland, found a job in Mong Kok, went astray and became a killer, and got involved in the bloody underworld. The person who supports him is the treacherous Lao Liu. He mixes in both black and white and is a police informant...