 Laughing is an extremely experienced undercover cop having spent most of his career working as an undercover in various triad societies.Prior to the events of "Lives of Omission", Laughing spent two years in an illegal armed weaponry gang as a spy for the mainland Chinese police before returning to Hong Kong to work as a UC (undercover) instructor.In order to bust Yee Fung, one of Hong Kong's most powerful triad society, Laughing employs Michael as his informant.