No Name in the Book of Life and Death, Working as a Ghost in the Underworld

[Single female protagonist] [Suspense and supernatural] [Novel setting] He is called Wuming because he has no name. Three years ago, a wisp of soul appeared inexplicably in the Nancheng underworld. This person was not found in the book of life and death, and his origin was a mystery. The King of Hell threw the case to Lao Wang, a trainee ghost sergeant. After investigating for a whole year with no results, he finally had to let him stay as a ghost sergeant. In this way, Wuming opened a detective agency in Nancheng, affiliated with the underworld, specializing in redressing the grievances of wronged souls, and also dealing with the unexplainable troubles between living people and ghosts. This person, whose origins are a mystery, is on both sides of yin and yang, investigating other people's cases while slowly investigating his own affairs.