No matter how much you deny it, jaekyung saved Dan from poverty, saved his grandma, did so many requests for him, and defended him --
I'm not justifying his actions, he's still a big asshole - but it's not like he has no hope this will sound like an excuse, but he doesn't know how to express it / have anger issues, ... Or read social cues - but it's not as bad as everyone's exaggerating him to be.
Anyways I'm just hoping that he develops into a green flag soon, there's no erasing of the past but he better apologize atleast