FNC their company ain't small, they like to play poor but they're not, they are in the top 10 of South Korea biggest entertainment company.
Kband are not the most popular in Korea, they have better popularity in Japan. That's why in the beginning of N.Flying's career their company focused a lot of the promotion there.
FT Island and CNBlue are 2 kbands who popularise band music a little more to korea. Those 2 groups used to be very well known there. They are from the same company as N.FLying, so when they debuted, FNC, expected them to be as popular as their older groups, but it wasn't the case.
Rooftop was such a hit in Korea, like the poor guys are always asked to perform it.
FYI Seunghyub, the leader with the deep voice is one of Seokjin's closest idol friend.
And Dongsung their new bassist and maknae, was in a predebut band with Kwak Dong-yeon, the younger brother in Vincenzo, they are still very close.