Legend has it that after death, if a person has deep obsessions and does not want to be reincarnated, he can jump into the Wangchuan River, wait for thousands of years, and return to the human world without drinking Meng Po soup. Drinking Meng Po soup can eliminate the past and the old dreams, and eliminate the causes and consequences. Forget all the ups and downs of this life, all the love and hatred in this life, and in the next life you will meet strangers without knowing each other; jump into the Forgotten River, in the filthy waves, and be bitten by copper snakes and iron dogs, and you will be tortured and unable to escape. Thousands of years later, if the mind is still alive and can still remember the events of the past life, it can re-enter the human world and eliminate the obsession of the past life.