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Summer nights are supposed to be the most pleasant time in small towns in the south of the Yangtze River - the evening breeze carries the fragrance of rice flowers and blows through the window lattice, and the chirping of cicadas is accompanied by the sound of the radio in the distant canteen. But in the attic where Song Qiang rented, not even a breath of wind could come in. Only the old ceiling fan squeaked and turned, making the air more and more stuffy.

In 2291, humans successfully discovered Universe No. 2. Since then, human beings have been out of control in their research on parallel universes.