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On a midsummer thunderstorm night, the little girl was awakened from her sleep, but her mother was nowhere to be seen. Only a tall mirror left in the middle of the dark room... After receiving a mysterious letter from a "man in the mirror", the young and promising police officer Guo Jia resumed investigating the recent cases of several missing women; with the help of newcomer Ma Yuansheng, the two discovered strange similarities among these mysterious missing women. A serial murder case with the "man in the mirror" as the murder mark? Where have all the bodies gone? Guo Jia, who is discussing marriage with his girlfriend, is overwhelmed at work and family. Just as he is getting closer and closer to the truth, the female writer Gu Xiaoyan, whom he once had a crush on, has also been deeply involved...