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A series of bizarre murders occurred in Jiangcheng. Strange red symbols appeared on the foreheads of the deceased. All clues pointed to the unsolved case of the Lin family's extermination ten years ago. The surviving young man Lin Yan has become a top criminal profiler. He uses hatred as a blade and vows to seek justice for his family. As the investigation deepens, the missing decorators, secrets about the mental hospital, and the burning of Wangxing Tower are revealed. The inheritance secrets of Xuanjiawei, the royal secret guard of the Ming and Qing Dynasties, are revealed: seals, scrolls, and secret keys to the underground palace. The careerists are crazy about grabbing them, and the building guards have been guarding them for generations. Lin Yan understood his parents' will at the edge of the abyss, put aside his paranoia for revenge, and transformed into a pursuer who protects the cultural heritage of his family and country. The fire has been extinguished, justice will return, and all the buried truth and perseverance will finally be revealed.