When each deceased person reaches the underworld, he will drink a bowl of Mengpo soup to erase the memory of the human world before he can be reincarnated. But ghosts are different. Their souls are incomplete and cannot be reincarnated.
There is a rumor in the underworld that the soul of a living person who has been deprived of life in the human world will not be intact after death, and the missing soul will be attached to the soul of the 'murderer', thereby strengthening the soul of the 'murderer' and prolonging his life. The person who is deprived of life will quietly wait for the arrival of his soul in the underworld, and the person who is deprived of life will become a ghost.
And no one knows their names because they are collectively known as Black and White Impermanence.
Because Black and White are ghosts whose life span has not expired, they can freely enter and exit the human world without any influence. If the ghosts in the underworld enter the human world, they will directly become evil ghosts and will never be reincarnated.
The black and white in the underworld have gone through countless generations, but there are always a few who will stay forever, because their souls are neither incomplete nor complete. They are all people who have been deprived of life in the human world, but they have also deprived others of their lives. Want to know their story? I said you listen.