Overview: All the evidence at hand suggests that FU is the killer’s real target but it is still incomprehensible why the bride ends up being shot instead. YEE and FUNG go to see FU but are shocked to see him being pursued by a man. YEE takes FU to the emergency room, where they run into SUM. SUM notices a dark red scar on FU’s waist and quickly tells YEE about this. Scientific Evidence Officer CHEUNG CHEUK-KWAN examines the stain left on the clothes of one of the shootout victims HO-LEUNG, and later determines that it is bluefin tuna oil. YEE learns from the sushi chef that LEUNG had come to see his apprentice CHI before his death. SUM has accidentally spilled some coffee on a girl named CHEUNG-LING at a convenience store, who is later found to have vitiligo on her face. SUM stalks LING for a while and catches her meeting CHI in secret. YEE and FUNG go to see TIM. But before they can reach him, TIM has fallen off the rooftop.