The plot of the micro-film shot by the campus reasoning club suddenly became a reality! The heroine of the micro-film, Xia Chi's girlfriend Qingzhi, suddenly received a mysterious letter and disappeared strangely. What's even more bizarre is that, as if she had never existed, no one remembered Qingzhi except Xia Chi and his good friend Meng Qin... In order to find Qingzhi, Xia Chi and Meng Qin had to try to solve the puzzle in the letter. They accidentally discovered that Qingzhi was brought into a game called "Duan Nao". In order to find Qingzhi, they broke into the game, and in the competition of IQ, EQ, physical strength, mental strength and even life, they gradually approached the truth of Qingzhi's disappearance, and gradually discovered that the Duan Nao game is not as simple as imagined...