Plot: YIU-WAH decides to apply for a police job and CHUN-BONG gives him tactical training but YIU-WAH still fails to get the job. However, he later receives a phone call from an employment agency and realizes that the Senior Superintendent of Intelligence Bureau of the Police Force, POON KWOK-SHING, wants him to be an undercover teacher in Lam Tin Kwong Memorial Secondary School for investigation of a campus drug case