"In my last life, I owed two people a debt of gratitude. One kept me alive, and the other set up a tomb for me after my death. When I find them, I must pay them back." Fu Qinghuan is a ghost from the underworld. She has been dead for more than a thousand years. Her obsession prevents her from being reincarnated. She travels in the hell on earth and realizes the cause and effect in the world.
Thousands of years later, the reincarnation of that person came to the eighteenth level of hell behind the triple karma sea, and opened the "Zi Buyu" where countless ghosts were imprisoned. Perhaps all this is cause and effect.
Intention: The world is always sad, everything is caused by cause and effect