[LOOK HE'S NOT LYING and he won't deny it if he's explicitly confronted, but he's an actions-over-words kind of guy, okay. Besides, he kind of assumes his own feelings are always blatantly obvious.... it's not like he makes much of an effort to hide them.]

Mm. Wei Ying is... [A lot of things, far too many to describe in words. But most importantly--] ...good. A good person. But reckless, sometimes. ["SOMETIMES"... how kind of him to add that.] He does not mind getting in trouble for others.

[HE NEEDS SUPERVISION, BASICALLY, is what Lan Wangji is trying to say. It doesn't completely explain why Lan Wangji's always thinking about him, but it's definitely not untrue, either.]