The current SM groups didn't really stop by in the whole 2 years i was there.
I was a trainee while Yeri from Red Velvet was a trainee too, the talk around was that she was really stressed out before debuting with RV.
I saw all the members of RV in real life, i never talked to them tho.
As I said, I saw a lot of newer group members, I saw almost all EXO members but I never really had a conversation with any idols, most of them are very self-involved from what I've seen and hard-working.