I think it'd be hard being friends with Tzuyu. She's too pure that all you want to do it protect her. I'm sure she gets tired of all the white-knights surrounding her. But you just can't help it with her. Just the simplest ways in how she communicates makes you think she's the sweetest being on the planet.
They honestly seem like good buds I don't shit them romantically I don't ship anyone romantically but charyoung and tzuyu feel more like a couple to me.