Qixinggang in Chongqing was once a mass grave during the Ming and Qing Dynasties. According to legend, when Zhang Xianzhong massacred Shu in the late Ming Dynasty, countless corpses were piled up here. There are 70,000 ownerless skeletons buried under the city wall of Tongyuanmen. Old Chongqing people still believe that "Qixinggang is haunted" and no one dares to walk alone at night. During the Anti-Japanese War, this area was used as a temporary air defense area, where many missing persons occurred, and relevant files were classified as confidential. On the first day of the rainy season, when Lin Xiaoman stood at the door of the old building dragging his suitcase, the weeds in the cracks in the bricks were trying their best to get out, as if they were trying to catch something. She didn't know that what she was about to open was not only the lock of the old wooden box, but also a bloody past that had been suppressed by bricks and stones for eighty years.
