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During SARS in 2003, 7-year-old Lin Shutong squatted in the hospital corridor and watched her mother being pushed into the operating room and never came out. The doctor said it was a "sudden complication," but she remembered that when her mother struggled, there was half a piece of jade stuck between her fingernails. During the 2008 earthquake, 15-year-old Zhou Yanzhi clutched his father's police hat and watched as he rushed into the rubble to save people and never came back. The case file said "Victims of Aftershocks," but he turned to his father's last call record - "The insider of the surgery was found." Ten years later, Lin Shutong became an undertaker. While grooming the old man, she dug out half a bloody jadeite from the familiar cracks of her fingernails. "It's the same as your mother's." Zhou Yanzhi's voice came from the phone. On his case file, the medical accidents 20 years ago, the "natural deaths" of witnesses in six unsolved cases, and the clues before his father died on the job were forming a bloody thread. Morgues, nursing homes, charity dinners, underground clinics... They walked upstream on the "death puzzle" left by the deceased, but when the last piece fell, they saw clearly the name hidden in the shadows-- It turns out that the person who should seek justice for the deceased has long since sharpened "justice" into a murderous knife.