ICAC Chief Investigator Luk Chi-lam (Louis Koo) and Chief Investigator Cheng Deming (Kevin Cheng) jointly investigated a smuggling corruption case and accidentally discovered another major customs corruption case involving human trafficking. This case is related to the leader of the terrorist group King and his mastermind Xiao Zhuoya (Michael Tse), and involves several senior leaders of the Hong Kong Customs. It also seems to be related to Asia's Chief Justice Pang Aima (Jessica Hsuan), who was invited to Hong Kong and secretly protected by JFIU Liao Baoqiang (Julian Cheung). Undercurrents are surging and confusing. When will the truth emerge...