Summary Pui Ching discovers that the letter has been opened. With the help of Sing Pak and a uniformed policewoman, Fok Po-ying, Pui Ching finds the ex-prisoner, Chun Hak Nam, who was involved in the case. Pui Ching recognizes Hak Nam as the survivor of a couple's suicide case seven years ago. Hak Nam insists that his girlfriend was murdered and begs Pui Ching to overturn the case. Hao Ran joins an insomnia group and gets to know Tam Sin Man, a new freelancer. A wealthy businesswoman, Tsui Suk-kuen, is robbed and killed. Sinnie is asked to question her boss, Wai Kin-pong, who is suspected to be the murderer because she was working as a publicist in his mansion. She remembers that there was someone suspicious that night. Hak Nam goes to the mortuary to look for Pei Ching, but a few punks break into the mortuary to rob the body. During the chaos, a security guard is stabbed and falls unconscious, and everyone is attacked by an unknown poisonous gas. .

• Crime