My job is to help ghosts fulfill their final wishes.
That is, until I discovered that my parents' disappearance was the ultimate unsolved case in the archives, filed as Case Zero.
A young man who inherits an ancient family book is forced to take a job at Huangquan Errand Service, an outsourcing company serving both the worlds of yin and yang. As he solves supernatural incidents in the city and searches for the truth behind his parents' disappearance, he gradually uncovers a shocking conspiracy bent on overturning the balance of the world.
