During a promotion ceremony for police officers, Senior Superintendent Ko Yat-tai is taken hostage. Seeing his father in danger, OCTB Senior Inspector Marcus Ko Ka-chun is unable to do anything. In a split second, Yat-tai’s eldest son Vincent Ko Ka-long, a member of the Flying Tigers, demonstrates his excellent marksmanship to save him, which unexpectedly acts as a trigger to bring what was buried in the Ko family back to light. A recent spate of murders of undercover cops, a surge of new drugs, and terrorist groups are a portent of a menacing future that Superintendent Lip Yu-hong relentlessly fights against. Meanwhile, caught in their own relationship dilemma, two brothers, Ka-long and Ka-chun, end up going their separate ways, turning into rivals...

Michael Miu Kiu-Waias Victor Lip Yu-hong
Bosco Wong Chung-Chakas Vincent Ko Ka-long
Ron Ng Cheuk-Haias Marcus Ko Ka-chun
Christine Ng Wing-meias Lo Man-na
Hugo Ng Doi-Yungas Ko Yat-tai
Cheung Siu-faias Leoi Cheuk-fung
Oscar Leung Lit-Waias Kenny
Venus Wong Man-Yikas Dai Yi-fei
Mandy Wongas Cheung Wai-shan
Grace Chan Hoi-Lamas Cheung Ya Sun
Ma Yan