Summary Po Ying tries to find out Sing Pak's relationship with Hoi Shing, but Sing Pak is ambivalent. After investigating the case of the corpse hidden in the coffin, Hao Ran thinks that the death of Da Tau is the starting point of the whole incident, but after re-investigating, he realizes that the real murderer of Da Tau is someone else. Sing Pak has a good idea that the murderer was able to fool the forensic department. ...... Pei Ching's autopsy reveals that the dead body of the coffin victim has Staphylococcus aureus, and the punch wound on his cheek suggests that the murderer might have been infected when he attacked the dead body.Hao Ran follows the clues to locate a female boxer with a wound on the back of her hand. Qian Wen is entrusted to secretly collect the tape of her wound, which Sing Pak finds out after the test ...... Qian Wen intends to start over with Hao Ran, but Hao Ran tells a story from the past .

• Crime