Lan Wangji tries to keep him steady and balanced as he stands on the stack of furniture.

"You found something up there? Is that why you're searching for it?" He takes his word for it, as it could be something important.

Still, at his request. "I can lift you up." He just needs to stand on the stack of furniture himself, finding his own balance, and then without much effort, he holds him up with a lift using his strong arms, so that Wei Ying can reach to fetch that paper.