Little off topic, but Netmarble (who apparently decided to participate in the final bid) claims to be releasing the BTS game soundtrack before release of the game. Article
If you like them, make sure to ask Nexon in the feedback section if a collaboration event/event exclusive soundtracks would be possible sometime after the next music update.
If not, then stalk Itunes. Maybe you'll get lucky and find Nexon copyrighted Mabinogi soundtracks on there too.
(Honestly, if Netmarble promotes Kpop, then just how bad could they be for KR?)