In Shanghai during the Republic of China, bizarre murders like ghosts seeking their lives occurred one after another in the French Concession. Shen Nian, a doctor of modern criminal psychology, traveled through time and became a female detective in the police station wearing a cheongsam and a windbreaker. She could see through the murderer's micro-expression, but she was helpless against the ghostly figure knocking on the window in the middle of the night. The gentle and elegant forensic doctor Gu Yan always delivered supernatural clues at key points, but his glowing, sickly eyes staring at the corpse made Shen Nian both dependent and vigilant. Archivist Su Xiaotang handed over the request with a smile, but what was hidden was the bloody secret of her sister's disappearance for many years. The rugged detective Huo Junyi only believes in quick cuts and chaos. Every impulse brings the truth closer and also brings danger closer. When reason and the supernatural confront each other head-on, Shen Nian must pry open the mouths of the living while avoiding the hands of the dead. She didn't know that the corpse Gu Yan dissected late at night was closely connected to the mystery of her time travel.
