Top forensic pathologist Su Ling hides a deadly secret - she is a "memory restorer" who can extract the dying memories of the deceased.
When the serial killer "Jigsaw" used ritual murders to leave a bloody triangle symbol, and each victim's memory fragments pointed to the next killing, Su Ling was forced to use the black technology left behind by her father.
The price is cruel: The pain of empathizing with the deceased brought her to the verge of collapse. What's even more frightening is that the symbol is closely connected to the mystery of her father's laboratory fire!
Lu Zheng, the hot-tempered criminal police captain, broke into her frozen world to solve the case. From questioning to witnessing the bloodstains of self-inflicted wounds on the back of her hands, he became determined to become her only anchor.
The two pursue the truth about symbols in a bloody puzzle, but they uncover a darker betrayal from their fathers: Experiment 7 Zhou Qiming, a vengeful ghost who has been deprived of the sense of pain, is using the city as a chessboard to force Su Ling into the same kind.
When the final puzzle piece reveals the neural circuits of hundreds of people, they must locate the devil in the torrent of memories in the city hall, and the core of the instrument flashes the father's final warning: "The container will eventually be filled with despair."
Concept: Pain is the last anchor of human nature