The Rebellious Xiaoman

According to historical records, a thousand years ago, the first king of mankind made a peace treaty with the beast tribe and built nine majestic cities. High walls stretched across the land, cutting off wilderness and civilization. The people in the city firmly believe that the barrier will protect all living beings forever. But the world has never thought deeply about it—— Are historical records necessarily the truth? Are their real enemies just the orcs outside the wall?