Special Duties Unit experienced instructor CHIN HON-TO (Joe Ma) employs draconian tactics to turn his subordinates into hardened cops. Nonetheless, his team worships him. Although he is particularly strict with YU HOK-LAI (Him Law) and YAU CHUN-HIN (Vincent Wong), he treats them as his younger brothers deep-down. TO’s friendship with co-partner cum good friend CHONG CHEUK-YUEN (Oscar Leung) is challenged when TING WAI-WAI (Christine Kuo) turns away from him and falls for YUEN for his cheerfulness. YUEN tells his teammate SO MAN-KEUNG (Mandy Wong) to pretend to be his girlfriend but his attempt to patch up with TO further complicates the matter. Meanwhile, intelligence reports that “King of Thieves” TO TIN-YUE (Ma Kwok Ming) is conspiring to rob the exchequer. TO and Organised Crime and Triad Bureau inspector CHONG CHEUK WAH (Jessica Hester Hsuan) are assigned to take charge of the proactive operation. WAH is YUEN’s elder sister. Her boyfriend was killed by a maniac and she has since been immersing herself in work in order to forget the pain. As TO and WAH see each other more, TO realizes they are the same sort of people and that he is falling in love with her.