Haesoo's thought at this http://www.mangago.zone/read-manga/love_or_hate_yeongha/uu/love_or_hate_yeongha-chapter-35
I'm sorry I know that didn't answer your question, I'm about to say it before but I accidentally clicked "Ok, Post It' and I don't want reply twice, so I'll just wait for your answer, bcs I know I'm at wrong.
I expect you will answer this way, you are so right!!! I personally don't like assuming someone's sexuality, but I don't deny that I was implicitly assuming Joowon's sexuality with my post, but I didn't mean it really, I'm more like not minding his sexuality. What I meant is ... at that time Haesoo looked at Joowon's interview with such sad gaze, I assume he would be even sadder if it'd happen irl. I just imagined that, in random way. That's it. That's more like my biggest fear if Haesoo doesn't end up with Joowon in the end, I'm afraid that he's gonna regret it for the rest of his life. Did that answer your question?
Just randomly thinking, imo it's fine if in the end of this manhwa Haesoo is gonna end up with Taku ...
But imagine one day they break up and Joowon who hardly gives up on Haesoo, finally moves on and gets married, he will regret not ending up with Joowon, and be forever agonizing and living bitterly for the rest of his life