Deep in the Shiwan Mountains in the southwest, Ran Qing, a young man from an ancient village, discovered a yellowed and shabby "Book of Yinshou" in a wooden box after his grandmother was buried. There is no annotation in this book, but it allows him to see the number of "remaining life span" under the birthday of a living person. By chance, he discovered that the life span of the elderly in the village had dropped sharply. After tracing the situation, he discovered a shocking secret: the local city god had abandoned his priesthood long ago and used the "Yin Shou Bao" loophole to force soul refining to plunder his life span and nourish himself. In order to stop the evil deeds of the city god, Ran Qing inherited the Nuo opera mask left by his grandmother, used ancestral formulas to open the passage to the underworld, and went deep into the underworld to explore the truth. On the way, he met Su Yanci, a Taoist girl who came to investigate the murder of his master. The two walked together, using Ran Qing's Yin Shou Shu to gain insight into the crisis, and relying on Su Yanci's magic to solve the mystery. They passed through an ancient battlefield filled with bloody corpses, using a century-old red coffin to suppress out-of-control evil spirits; they crossed the Naihe Bridge on the other side of the Forgotten River, and competed with the ghosts of the underworld; finally, during the decisive battle in the City God's Palace, Ran Qing made an astonishing decision - to carve his name on the legendary Ghost King's coffin, use his own yang life as a guide, leverage the law of yin and yang, and give all the yin life gained to the plundered dead, reshaping the balance of life and death. This is a mortal struggle against the selfish desires of gods, and it is also a chivalrous legend written in the realms of Yin and Yang.
