The two Lingnan people sent by He Lianfang were genuine locals of Lingnan, not descendants of criminals exiled there. They were from the Hidden Mountain Tribe in the Upper Lingnan.
Lingnan is divided into Upper, Central, and Lower regions, based on the terrain. In Lingnan, locals almost never refer to themselves as residents of a particular city; instead, they say, "I am from a certain tribe in Upper Lingnan," or "I am from a certain tribe in Lower Lingnan."
While the division is based on terrain, Upper Lingnan is more prosperous and powerful than Central Lingnan, with Lower Lingnan being the poorest in Lingnan.
The reason the two people from the Hidden Mountain Tribe could speak the official language of the Great Zhou was because everyone in their tribe interacted with the Central Plains people, specifically those exiled to Lingnan.
