Towards the end of TVB series, Lives of Omission <潛行狙擊>, “Laughing Gor” Michael Tse was sentenced to life imprisonment after murdering Bosco Wong's character. In prison, Laughing met Francis Ng, a university professor imprisoned for drug possession. Despite the professor's gentle and aloof exterior, he was a vicious, cold-blooded criminal. Furthermore, the professor was a criminal psychologist able to discern other people's inner secrets and dark side. Due to such abilities, the professor was able to silently control others. At this time, a mysterious woman, who worked for high-level Security Police unit, visited Laughing in prison. Laughing's imprisonment was spurred by his role in an undercover assignment. It turned out that another person was responsible for Bosco Wong's death. Suspecting that the incident involved a corrupt police force, the Deputy Secretary for Security Police assigned Laughing to investigate the case while posing as an inmate.
Cast
Main cast
Michael Tse as Leung Siu-tong, nicknamed Laughing Gor, prisoner 76133, the main protagonist of the film, a former station sergeant of the Criminal Intelligence Bureau who was sent by Security Security Bureau Undersecretary Lai Cheuk-yin to go undercover in Stanley Prison to retrieve a list of corrupt cops.
Francis Ng as Fok Tin-yam, prisoner 77015, the main antagonist of the film, a university professor and criminal psychologist who is the mastermind who manipulated the corrupt cops, hoping to start a revolution.
Chapman To as Tai Chit ), prisoner 74635, a former station sergeant of the Narcotics Bureau who feigns mental disorder to cover his identity as one of Fok's followers.
Bosco Wong as Michael So, nicknamed Crippled Co, the main leader of Yee Fung Triad and Laughing's nemesis who was seemingly killed by Laughing during the events of Lives of Omission, while in reality, So was killed by Tai Chit, who was formulated by Fok Tin-yam to do so.
Kate Tsui as Paris Yiu, a former barrister and girlfriend of Michael So. Due to the death of her boyfriend, she suffers from posttraumatic stress disorder and becomes Fok Tin-yam's patient.
Janice Man as Carmen, the Executive Officer of the Security Bureau who is Laughing's contact person, while in actuality, she is a spy working for Fok Tin-yam. Despite so, she is in love Laughing and sacrifices her life to save him.
Evergreen Mak Cheung-ching as Lai Cheuk-yin, the Undersecretary of the Security Security Bureau who plants Laughing undercover in prison to retrieve a list of corrupt cops.
Lam Suet as Kui Chuen, prisoner 75312.
King Kong Lee as Nidaime, prisoner 69248.
Jin Au-yeung as Yeung Lap-ching, Laughing's apprentice who was a constable of CIB, and is now a second class prison officer in Stanley Prison
Ram Chiang as Officer Sing, a girst class prison officer in Stanley Prison
Lau Siu-ming as Ye Po, prisoner 58318, Sa Po-yau's father who opposes his daughter's collusion with corrupt cops.
Rebecca Zhu as Miss Choi, Fok Tin-yam's girlfriend who testifies in favor of him in court, prompting to be released without charge.
