Han-yeong is avoidantly attached and Cheong-hyeon is a little autistic. Period.

Wait, isn't it other way around?
Cheong-hyeon is very socially adequate, he has some features of narcissist tho
And MC seems to have emotional blindness, like he can't recognise and identify his own feelings, autistic ppl often have it
I dunno, it's interesting how different they come across to us, I guess

I accidentally swapped the names in my head and it still fits tbh