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Nicknamed "Laughing Brother," police officer Leung Siu Tung (played by Tse Tin Fai) successfully completes his undercover mission and is given an important role at the Criminal Investigation Bureau (CIB). However, the Chief Harry (played by Lau Song Yan) and his superior Jodie (played by Chan Fat La) have doubts about the death of his handler. During their investigation, they uncover hidden secrets. After the CIB recruits new members, Laughing and Jodie, due to their differing training philosophies, become a pair of bickering yet affectionate colleagues, each holding their own ground and neither yielding. In addition to caring for his wife who is battling cancer, Harry must also deal with his ex-girlfriend Yuan Jun Lan, who has just been released from prison after serving a twenty-year sentence. Fortunately, his son Aidon's exceptional dancing skills and his willingness to help others bring him peace of mind. To counter the Yee Hing Triad, Laughing cultivates Lam Cho Michael (played by Wong Chung Tak) as an informant. Michael gradually rises in the ranks during the power struggle between the triad leaders Lai Geng and Willie, eventually slipping out of Laughing's control. He reignites his romance with his former lawyer girlfriend Yiu Ho Ho (played by Tse Tsz Shan) and strives to climb the ranks. As the triad leader Mo Yat Lit returns, the rivalry between undercover police and triad members, as well as the struggle between good and evil, intensifies...