Shadows of the Golden Age: Survive from Devouring Yin Qi

A young boy who had just become a social animal was involved in a ghost-killing operation by special forces members on his way off work. He was supposed to be dead because he absorbed the essence of the ghost after its death, and he began to guard the human world. Is this world the underworld? There is no King of Hell, no demons, demons and horses? What about other gods in Chinese mythology?