The worldbuilding in these chapters is absolutely stunning, and I want to talk about how the author does it—not through exposition dumps, but through Qin Ziheng's eyes as he pieces together this impossible world. Let me just... the cave itself. It's small, half the size of his guest room back in the capital, with a stone bed and a giant scallop shell being used as a pot. The detail about the scallop shell is genius—primitive but resourceful. And then there's the firewood stove scene, where Mao Xiaoshu keeps failing to stack the stones properly because he doesn't understand which side should face down. Qin Ziheng, who grew up in a village and learned to cook over open fires with his grandpa, steps in to help. This tiny moment does SO much worldbuilding—it tells us about Qin Ziheng's rural roots, about Mao Xiaoshu's tribal upbringing, and about the practical knowledge that bridges their two worlds. Then the view from the cave mouth: the big tree, the bamboo grove, the wide river, the plain, the unbroken mountain ranges. And the other tribe members—wearing full hide garments, one with a leopard's tail, another with rabbit-like ears drooping to their shoulders. The author doesn't explain any of this. We discover it alongside Qin Ziheng, and that makes it feel infinitely more real. The birdsong that confused him at first, the primitive stone houses with no windows (because drafts let in Woo-Woo Beasts—what even is that??), the smoke from cooking fires in the early morning. Every sensory detail grounds us in this world. I could practically feel the damp cave air and hear the stones clattering.