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Story summary - **Death Express**: Female college student Lin Xia received a strange express delivery from her late friend. The package actually contained a bloody severed finger, triggering the reopening of the investigation into the unsolved serial finger amputation case three years ago. - **Memory Fragments**: During the investigation, criminal investigation team leader Han Shen discovered that Lin Xia's deliberately concealed experiences intersected with the deceased, and Lin Xia himself seemed to suffer from traumatic memory disorder. - **Blood Puzzle**: As more fragments appear in different places, the identities of the victims gradually piece together surprising connections, pointing to a revenge plan that lasts for twenty years.