AI cause of death analytic system CODAS and Dr. Cho have different opinions about the accident.

A victim falls in flames. Jin-woo thinks the criminal may have done this to serve justice.

Two officers are killed at an abandoned building, shocking Hyuk-min with CODAS.

Bloodstains are found at an empty church. Jin-woo and Nam investigate rumors about zombies in Muil.

A man discovers hung victims smiling oddly, with a brain implant found.

Another apparent suicide is found as 16 members of a web community vanish.