But what if he just got with Alex because he couldn't be with Alex's brother. Basically using him as a replacement. aquashine
I was thinking along the same line as well. After all he did say that it was a pain/ annoying of how perfect Jiwon's brother was. Probably meaning he could not influence the brother to like/ fuck him or 'turn' him gay.
I couldn't help but notice how close Ms ha and haebom's mom were so close I wonder if there is a side story to that.