you said it, haesoo loves and cares for joowon but it isn’t romantic love. the reason why haesoo never fully committed to his relationships is because joowon imbedded in his mind that no matter what he’ll always come back to him and says stuff like “I wonder how long this ones gonna last”,,, sigh this is so frustrating
Imo he was sincere and there wasn't hidden agenda behind his words.
And for me if they won't end up together which is rather possible they should cut their ties off. Playing brothers, being friends is not an option for them. They never thought about each other as brothers in the first plays (although the taboo was always keeping their apart, imo one of the biggest factors why their relationship never progressed but there are many other ones ofc) and they have too much heavy history between them. It would be like living in another lie.
And Joowon looks like the type who won't move on as long as Haesoo will be in some form beside him.
People be talking about Joowon being toxic when Haesoo over here getting off on the chase. He literally said he craved an obsessive relationship with Joowon. They're both at fault for how they ended up. They're two idiots in love who have the added pressure of being a "family". That may just be my opinion but I honestly think Haesoo kinda spelled it out himself.
The story does seem to be moving in a TakuxHaesoo direction, but I think it would be fine if he went back to Joowon ONLY if they put everything on the table and stop hurting each other. Maybe start over and rebuild from a healthier basis.
Also, I think Haesoo's mom is more to blame. Joowon's dad seemed like he was willing to overlook it so he could be with the woman he loves, but she can't seem to get past it so she's the one shooting herself in the foot and making her kid feel miserable.