A "seven coffin corpse case" in an abandoned building on the outskirts of the city has opened up a mystery of folk occult that spans twelve years. Chen Jiugao, a private detective with ancestral yin and yang eyes, has an indissoluble bond with the "Nine Coffins" because of his mother's mysterious disappearance. Whenever a rainy night reappears, the bronze bells will ring, and seven ancient coffins will appear with the seal of the rotting corpse. Mysterious nursery rhymes and corpse-killing formations will appear at the scene of the case. The corpse's posture is strange as if it is a sacrifice, and behind it all point to an ancient organization that controls the secrets of life and death - the Nine Coffin Gate.
Female detective Lin Xiaoyu joined forces with Chen Jiugao with suspicion of "feudal superstition", but found during the investigation that all the cases were deeply intertwined with the shadows of their childhoods: the coffin that mysteriously disappeared at Chen Jiugao's father's funeral, the Beidou pattern carved on the palm of Lin Xiaoyu's grandfather before his death, and the Dou Dou in the Provincial Museum surveillance camera Li's man in black... As the mechanism of the old house on Huaishu Lane is opened, the corpses in the morgue of the funeral home are strangely "arranged", and the "nine coffins open the door" in the nursery rhyme gradually come true, the two people are in the collision of folk taboos and scientific criminal investigation, but they do not know that they are already "living sacrifices" locked in the formation.
The death curse in the ancient coffin hides murderous intent, the paper figurine of the ghost marriage will change places at midnight, and the green grass on the grave can predict the date of death... When the curse mark on the back of Chen Jiugao's neck completely coincides with the symbols at the case scene, and when Lin Xiaoyu discovers that the police badge left behind by his father contains the secret volume of the "Nine Coffin Gates", the truth points not to solving the case, but to a "game" designed from birth - the "Yellow Spring Road" where the Nine Coffin Gates are to be opened is never for resurrection, but for a living person to die.
