Through the Map of Mountains and Rivers hidden by the Yu Family, Ling Hua could deduce that the Yu Family relied on the Ning Family of Biyun Mountain, and the Ning Family's scheme was to redraw the boundaries of Ling Mountain to resettle the territory of Houliang.
The Ning Family knew that they could not touch Ling Mountain, so it seemed plausible to scheme for the world with Ling Mountain as an ally.
The Ning Family must have felt that the Ye Family of Ling Mountain would largely have no objections, since the Imperial Family had been wary of Ling Mountain since the previous Emperor's reign, and the descendants of Ling Mountain might not like the feeling of being feared and remembered by the Imperial Family. Therefore, to divide the world into three with the Imperial Family, as long as Ling Mountain had no objections, this scheme might just succeed.