No cus in the raw I'm not sure but take it with a grain of salt he said something about han gyul brother being a insurance sort of as a backup plan. I don't think they understand that he doesn't actually love hangyul brother but he was drawn to him because he is similar to hangyul and personally I think haewon just want a family so bad the why he want to be with hangyul brother. I don't him with han-gyul brother because of that but I think him ending up with someone else besides mc brother is better.
"backup plan" is craaaaazzzzzyyyy if it's true also you're right he should end up with someone else after all that but I doubt it the author said they might change it up in season 3 like some last minute couple probably because that pairing became famous among the readers I would know I said heewon didn't actually like the brother some time ago like in my now comment and they hated it so bad lol
Love your username btw
Lmaoo thank you.
I'm still going to get booed for this and idc even the brother said it heewon never actually liked him even the author said it they were only ment to be supporting characters not even a second couple I still think the only reason he had a "crush" on the brother was because he's HANGYUL'S BROTHER they're kinda similar