How popular was CNBLUE?

i don't know i was never a fan of them

all i know if that during my debut as a kpop fan i used to heard i'm a loner everywhere and it seems that they peaked during i'm a loner

since the song end up being the #8 best selling song in korea on the digital downloads in 2010

and ranked #10 on the streaming chart of the year

and they hold the record of quickest group to win in a music show until Winner debut