The hell here is not a myth or legend, but a precision-operated "school of cause and effect."
It is based on the eight hot and eight cold hells in the Buddhist scriptures, and integrates rules such as karma visualization and mind as environment to build an absolutely fair and never-tiring soul purification system.
The torture of the dead souls here is not punishment, but learning; pain is not the purpose, but teaching material.
The whole book abandons the traditional main narrative and interweaves more than forty soul units into a network:
The lantern keeper keeps watch in silence for thousands of years
Retrograde guest uses scientific logic to deconstruct the underworld
Perfectly good people are trapped in the self-woven web of merit.
The outspoken villains face their blood debt without fear of liquidation
Sisters who bear each other's sins are bound forever by their karma
The monk who broke the precepts to save others understood the meaning of killing and loving kindness in "listening to punishment"
Every soul is a mirror that reflects how greed, anger, ignorance, pride, and doubt grow as karma in human nature.
Intention: Let everyone who gazes see themselves.