Thanks @hotteokah for bringing this back to life! You've renewed my interest in the story so I took a look at the most recent raws. Unfortunately, although I might be wrong since I can't actually read Japanese (or Korean or Chinese), it seems to be going the same way that many shoujo series with one of the plots I detest the most.
Best friend of male lead becomes a "friend" of female lead but really wants to make her his own girlfriend.