Kate Tsui
The third and fourth installments are separate reboots, each following a similar outline to the original duology but features different cast and characters. The third installment stars Pro Sir (Wayne Lai), a senior forensic chemist, and his close friend Mandy Chung (Maggie Cheung Ho-yee), a senior forensic pathologist. The two work closely with Senior Inspector Ada Ling (Kate Tsui) and Sergeant Lee Chin-fung (Ron Ng) of the Kowloon West District Crime Squad.