first of all no social skills can mean anything and since the drama name is the wonder fools, it probably means…
He has supernatural powers which he keeps secret that's why he doesn't interact with anyone. Nevertheless his character would not need much expressions like most of his previous projects.
"Lonely person with no social skills" yeah that's exactly Cha Eunwoo. I thought his acting and roles are improving but he is back to the same kind of roles.
https://mydramalist.com/list/450KxOG3