Follow Your Passion: A Seamless Tumblr Journey
I think wwx would have some of the curliest hair ever though he generally does not know how to take care it properly, not because he's unhygienic but, because nobody at Lotus pier really has his texture of hair.
Lan Wangji finds out about this somehow, and makes it his lifes misson to figure out a way to make wwxs hair life easier.