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In order to find his sister who had been missing for three years, Nangong Fanxing, a senior high school party member, put on the ring left by her sister, but unexpectedly came to a special university. What is waiting for him, and why is his sister missing? Or just a dream?

"If the dream is true, is the reality false? If reality is false, then what is real? What is the boundary between true and false?"

On September 11th, a soul returned after ten years and returned to the eve where the nightmare started...