I still haven't finished Love with Flaws and am only about half way through, but from what I can remember, the main couple wasn't all that interesting, and I was more invested in the BL situation. (Sorry, I literally don't remember much.) 

From what I can recall, there was this guy who was tricked by another guy and he ended up meeting the female lead's brother a bar, or was there like a breakup and he was trying to make someone else jealous or something.

I really would like to have a drama that has a plot that, with that couple being focused on, so if it is a BL or GL, that would be preferred, and a K-drama please.