This book was written during the Yongzheng period of the Qing Dynasty. It is a good book of Yin laws that has been circulated for a long time and has been revealed by heaven. According to legend, a Qing Dynasty Taoist monk named "Dan Chi", by chance, entered the underworld in the Yang body, visited the halls of the underworld, and witnessed the actual scene of karma, retribution, soul examination and punishment of evil. The "Jade Calendar Treasure Note" was obtained in the underworld, and he was ordered to bring it out of the world to inform the world, to encourage good and stop evil. This book faithfully records what he saw and heard, with detailed annotations and supplements. It is a travelogue to the underworld that combines religious culture and supernatural legend.
