Old movies in the past always talked about such a place. That place is not the underworld, nor the underworld, nor the Huangquan Road with Meng Po Soup and Naihe Bridge. That place is where the soul stays within 7749 days after death, and there are also lonely ghosts wandering there who cannot be reincarnated. There is indeed a place in this world called the Yin and Yang Realm...
Gentlemen who know the world of yin and yang all know that ghosts do not like lights, so they rarely appear, but every twenty years when the evil star - the Erhei Giant Gate Star flies to the world, those Yin spirits gathered in the spiritual world will appear in the long silence...