In 2004, 10 months after the murder of Yan (Tony Leung Chiu-wai), Ming (Andy Lau) is transferred to do the office work. Meanwhile, a new star Wing (Leon Lai) has emerged in the police force. Ming suspects he is also a mole sent by the triad. Three years ago, Yan's first big mission was to build up a smuggling network with Shen (Chen Dao-ming), a mysterious businessman from China. Actually, Yan's was out of control and he was forced to see psychologist Dr Lee (Kelly Chen), but he gradually developed a special friendship with her.