The spirit realm is a place where life and death are reversed and yin and yang rotate. It is not so much the underworld and the underworld in the traditional sense, but an upside-down human world. Here, ghosts play the role of the living, with birth, old age, sickness and death, and disasters Fu. Born from the mother's womb, lived a peaceful life, and finally buried with gongs and drums, is the epitome of these ghosts' life, just like ordinary people in the world. On the contrary, people have become the most terrifying in their eyes Monsters, the most common words they say are not to do bad things during the day, and not to be afraid of people knocking on the door at night. Since ancient times, people in the mortal world go to the spirit world to live for a lifetime after death, and ghosts in the spirit world go to the mortal world to live after death. For a lifetime, the two worlds have maintained such a delicate balance. Until one day, Lu Zhe, who had traveled over, accidentally discovered that he could open a door to the spiritual world in the mortal world at will!