"Mm." Lan Wangji pauses for a moment while Wei Ying gets his flute, and he takes out his hair from its ponytail, shaking it loose. It's got a wave in it from being up so long, and when he shakes it out, it looks voluminous and wavy as if in a commercial for shampoo.

Naturally, he only does this to readjust, and he decides it's too hot for a ponytail, and gives himself a long braid instead.