Working as an undercover for many years, Laughing (Michael Tse) escapes from all calamity. Two years ago, he underwent special training to become a mute and worked in mainland China as an undercover. Closely working with the mainland Chinese police, Laughing successfully busts an illegal armed weaponry organization and resumes his identity as a police officer in Hong Kong. He is appointed as head instructor of the Criminal Intelligence Bureau (CIB), specializingin seeking and training CIB recruits in undercover work. Laughing, however, is unable to adapt to the stress in the discipline of police life and becomes a rogue cop. To get his jobs done quicker, he hires the gangster Michael So (Bosco Wong) as his informant. On the surface, Laughing and Michael appear to be good brothers, but in fact both have their own purpose, mutually taking advantage of one another. Feeling as if Laughing is holding him back from "moving up" in the triad, Michael betrays Laughing and decides to work alone. To tackle down the triad's crimes, Laughing applies to be an undercover once again.
The drama is a spin-off of TVB's successful television crime drama E.U. and a distant sequel to the 2009 film Turning Point, with Michael Tse reprising his role as "Laughing Gor." Lives of Omission premiered on 1 August 2011 and ended on 9 September 2011 with a total of 30 episodes. It is Hong Kong's second highest-rating serial drama of 2011, and won Best Drama at the 2011 TVB Anniversary Awards. Lives of Omission centers around a squad of undercover officers from the Criminal Intelligence Bureau of the Hong Kong Police Force, who are closely following the activities of Yee Fung, a large triad society. Experienced undercover officer Laughing, station sergeant of the CIB, promises to help gangster Michael move up in the triad under the circumstance that he works as Laughing's informant.