In another time and space, Xiacheng District is set in the 1920s, Li Qingshan and Zhao Hongyu. The title not only points out the background of the era in which the story takes place, but also hints at the ups and downs of the characters' fate and the changes of the times. And add science fiction elements. The second half is almost entirely science fiction. But his imagination is huge, not inferior to the Three Body Problems. Totally inappropriate.
