LAI cannot believe that POK is in love with her. To make sure he has really made a declaration of love to her, she decides to double-check with HEI. LAI gets dressed up for her first date with POK. She asks POK how he fell in love with her, and POK explains that it is all about the influence of phenylalanine. A badly burnt body is found in Kam Tin and the victim is an active gang member called KAM TAI-PANG. LAI and PAK-CHU try to gather more background information about PANG from the Anti-triad Unit, from which they learn that PANG used to be very close with a hairdresser named KONG YIU-CHO. Based on the data of PANG’s Octopus smart card and credit card, the police have worked out the approximate time of the murder. CHO was watching a football match at a pub when PANG was reportedly killed, which serves as a very strong alibi for the guy. HEI gets bullied by his classmate……