Gu Changan, a modern time traveler who lives in the Dayu Dynasty and works as a jailer in Tianlao, accidentally activated the [Sky Eye Crime Solving System]. Whenever it comes into contact with a case, the system will provide clues that ordinary people cannot detect. At first, he just wanted to use the system to make a living in prison, but he accidentally solved an unsolved secret room case that troubled his boss, and he has been out of control ever since.
He was promoted to the "Delinquent Department", which specializes in investigating crimes. Starting from an inconspicuous clerk, he repeatedly solved strange cases by virtue of his magical ability to "see clues". From "the ghostly woman on a flower boat serially asking for her life" to "the headless general knocking on the door late at night", and then to the "ghost robbery of water transportation in the south of the Yangtze River", Gu Changan's reputation is getting bigger and bigger, and his official position is also rising.
In the process, he got acquainted with Ye Liuli, a master of the mysterious assassin organization, and was also involved in the battle for the crown prince and the kings. As the cases solved become more and more shocking, all the clues eventually point to a huge conspiracy hidden deep in the dynasty - a huge force trying to subvert Dayu and return the world to war. Gu Changan went from being alone at first to protecting the people around him and the peace of the world, and finally chose to confront this dark force head-on and became the patron saint of the Dayu Dynasty.
