Time setting: Modern times and the first year of Shenlong (705) are parallel, and a space-time wormhole is formed on a rainy night.
Location setting: From the take-out electric car to the spatial folding of the Zichen Palace in the Tang Dynasty
Basic background: Delivery boy Li Ergou accidentally traveled to Tang Zhongzong Li Xian on a rainy night and discovered that the historical process is linked to the battery of the mobile phone.
