Pui-ching identifies the weapon used in the street attack, while Sing-pak's team makes a crucial discovery from the suspect's blood sample. The suspect's ex-girlfriend goes missing, prompting a search that uncovers suspicious clues.

Sing-pak investigates Po-ying’s disappearance with the help of an old friend in Japan. The team discovers new evidence at the missing person's flower shop and tracks down a suspicious truck driver, whose silence and connections to the case raise further questions.