Chief Inspector Liu Zhengxi (played by Tony Leung) and his wife Jin Shuzhen (played by Xu Jinglei) live a sweet life. Qiu Jianbang (played by Takeshi Kaneshiro), who was a colleague and friend of Liu Zhengxi, became a private detective after being dismissed from his police job. He drank until he was drunk all day long. Because his girlfriend committed suicide many years ago, he could not forget it for a long time, and his relationship with a prostitute...