A story within 24 hours. In order to search for his missing girlfriend, Lai Fu immigrated from mainland China to Hong Kong and found a job in Mong Kok. He went astray and became a killer, embroiled in the underworldIn the rain of blood. The treacherous Lao Liu who carried him was the informant of the police, who had infiltrated the black and white circles. As a result, Lai Fu embarked on a desperate journey. During this time, they met the prostitute Dan, and their similar backgrounds made them meet as usual. DanDetermined to help Laifu find his girlfriend, while also changing himself