Beneath the clamor of the modern city lies a forbidden past, long since forgotten. A spiritual cavern buried deep underground is accidentally exposed by a commercial development, releasing yin energy and triggering a string of bizarre paranormal events: souls leaving their bodies, the dead rising, awakened people losing control, and a wave of terror rapidly spreading across the city. Chu Yan, a young doctor of traditional Chinese medicine, was once entirely ordinary. But the pull of his ancestral bloodline draws him into the cavern's vortex. He accidentally opens a bronze casket sealed for a century and inherits the legacy of a Spirit-Healing Celestial Master: the power of a “Purifier.” As his ability to sense spirits awakens, Chu Yan discovers that the cavern is not only a prison for the dead but also a vital link between the worlds of yin and yang. The price of awakening this power is the gradual erosion of his soul. With the help of paranormal investigator Li Man, Chu Yan begins searching for the truth behind the cavern while facing increasingly dangerous threats, from those who have lost control to evil spirits. As the investigation deepens, they uncover a schism within the Spirit-Healing Celestial Master family, the secrets of the cavern, the origins of the awakened power, and even a far-reaching conspiracy enveloping the entire cycle of reincarnation. Deep within the cavern, Chu Yan must face the hardest choice of his life: sacrifice himself to seal away the evil spirits and end the disaster, or risk letting the awakened power run completely free and send the cycle of reincarnation toward an unknowable future? The salvation of souls, the price of power, the awakening of forbidden arts: every mystery points to the same question. Can the Celestial Master's taboo be broken?
