The protagonist Chen Jiuyin was born in the yin month of the yin year. His mother died during childbirth. Her body was sewn into the ancestral "blood jade bracelet" and buried in the Chen family's ancestral grave. Eighteen years later, a "nine corpse serial murder case" broke out in the village. The blood of the deceased was drained, and the corpses were arranged in the shape of a Big Dipper. During the investigation, Chen Jiuyin discovered that her mother's tomb was actually an empty tomb, with only a blood-stained Yin marriage contract remaining in the coffin. The blood jade bracelet mark that appeared out of thin air on her wrist was the key to suppressing the "Grudge of the Nine Corpses".
