The protagonist is a small border official. When he was dealing with a strange case, he discovered that many people had their essences sucked dry, and a broken bronze mirror was left at the scene. In order to cover up the truth, he was falsely accused of corruption and bribery, and was assigned to the Tiance Department as a handyman.
In the Tiance Division, he witnessed a suppressive operation against the demon clan, but accidentally triggered the power of the bronze mirror and caught a glimpse of someone among the "high-level officials of the Tiance Division" secretly dealing with the demon clan. He was forced into a conspiracy, and in order to survive, he used his talent in solving crimes to gradually gain trust.
