People's hearts are filled with deceit, and all things leave traces.
This is a world where "shadow erosion" is rampant. Strong obsessions will leave "shadow marks" and breed "shadow evil spirits". The Dajing Dynasty established the "Light Night Division" for this purpose. The lantern guards held special lanterns and patrolled the night to illuminate all illusions.
When Shen Zhu, a criminal investigation expert from modern times, travels to this strange world and becomes a Xuanyi guard who is marginalized because of his half-demon ancestry in Dengye Division, everything will change.
Criminal profiling, trace science, forensic identification, micro-expression analysis... These "wonderful skills" from another world have become the sharpest scalpels in his hands.
A seemingly dilapidated "first-generation lantern" accompanies him to uncover a series of confusing and unsolved cases: the life-threatening "Painted Skin Bride", the immortal "Ghost Captain" at sea, the Miao border secret technique of using living people to raise poison, and the "Shadowless Kingdom" that attempts to swallow up all emotions and subvert the dynasty...
The exclusion of colleagues, the curse of blood, the secret fights in the court, and the secrets of the ancient sect. What he has to face is not only the monsters that choose people to eat, but also the human heart, which is even more unpredictable than the monsters.
