People are separated after death, and the living are on earth, that is, the dead are going to the underworld. The underworld and the underworld are different spaces that separate the dead from the living.
The space where human beings live is called the dead, and the space where the soul is after human death is called the underworld. One yang and one yin in space constitute the whole cemetery of the universe, and the time and space of living in the underworld after death, the positive space and the negative space constitute the whole space of the universe. There is a bridge between yin and yang, and there is a saying of Meng Po Tang.