Legend of the Paladin
The Truth behind "White" is probably that the Original "White" was the Dessert. His Path to immortality was that of entropy and the endlessly shifting sands. When "White" became the wielder of the will he was forced to splitt defining features of himself of so to create the lord of the neatherworld. Chosing the Jung man in Green (his least favorite aspect). When vacating the Will he then split of another aspect to survive, chosing "little white" (his favorite aspect) leaving only the "White Horse" to perisch as the will.
well it makes sense that senior white split himself in two...maybe it was a resurrection method? but still..there is the white horse, I did day that the position can be given to wilder of the will white but that won't be right cuz when someone ascends to the weilder of the will position a similar personality is born in netherworld so netherworld white and weilder of the will white are a single entity
If Senior White Two is the Young Man, Wielder White(past) is the horse, and Senior White is Little White, there are potentially two more characters, the Desert and the Visitor. I wouldn't be surprised if Shuhang really IS the Visitor in that scene, what with Shuhang drifting through the past sometimes. Maybe the Desert is White(post Wielder)? đ¤