Under the Naga River

Generations of emperors' sons sailed across the Changchuan River in their solitary boats, and their lonely shadows disappeared under the Changchuan River, never to be heard from again. In the small world of Xianxia, ​​fog spreads around the continent, trapping the world like a cage. Only the eternal empty flow of Changchuan River in the south is the Tianhe River leading to the big world. Or a dark portal?