Jiang Yan is the youngest chief medical examiner in the city. He can read the cause of death, time, and murderer from the corpse - but he cannot read the words on the chest of the male corpse: [Rule 1: Do not look directly at yourself in the mirror].
That night, the entire forensic center fell into a mirror hospital. The walls were covered with rules, and anyone who violated them would die.
Others saw another version of themselves in the mirror; Jiang Yan only found gaps in the body spots and wounds that shattered the rules.