The Legend of Monsters Begins with the Suspended City

(Monster + Urban Power + Traveler + Suspense + Doomsday) Zhao Guiyi traveled through time, but on the first day he traveled through time, the end of the world came. A huge floating city appeared in the sky, and countless disks flew out of the floating city. From that day on, monsters appeared frequently in the news, the weather became strange, and a huge conspiracy seemed to have gradually surfaced, and this conspiracy was closely related to Zhao Guiyi. What should Zhao Guiyi do?