Deep in the desert of northwest China, there is an ancient civilization that has been deliberately erased from history books - the Guifang Civilization. This civilization possesses the heaven-defying "Secret Technique of Underworld", which can not only build underground mausoleums comparable to mazes, but also predict the future through astrological deductions. Its core mausoleum, the "Nine Nether Ghost Cave", is said to be a portal connecting yin and yang. It contains the "Pathstone" that can resurrect the dead and the "Secret Book of the Underworld" that controls life and death. For thousands of years, countless tomb robbers, alchemists, and warlords have tried to explore the secrets of the ghost cave, but they have all disappeared into the yellow sand, leaving only the legend that "if you enter the ghost cave door, you will never see the sun tomorrow." In the early 1990s, Chen Mo, an archaeologist from the Northwest Institute of Cultural Relics, discovered a Tang Dynasty mural with a mysterious compass in the Mogao Grottoes, and was accidentally involved in a life-and-death mystery that spanned a thousand years. At the same time, a mysterious organization calling itself the "Huangquan Society" is also operating secretly. They hold half a bronze compass and aim directly at the secret treasure at the core of the ghost cave.
