
Bro did I read the same story as you guys??? What? If I remembered correctly, Jowoon brought pain towards Haesoo because they may not be blodd related, but its weird when you parents hook up and then you hook up yourselves. Because at that point, you are considered family. I honestly wanted Haesoo to find his own happiness by not choosing either of them. He need some self love for himself. Jowoon wont fix this because solve self appreciation. Of course, he shares a lot with Jowoon and still cares about him, but his heart has been broken so many times in the past and just because Jowoon apologized and realizes how much of an asshole he was, doesn't mean Haesoo has to accept it. Haesoo needs time to himself. And with Taku, he knew this was a loosing battle, but he actually wanted to be with Haesoo since he caught his attention. But unluckily for him, he was already distracted by Jowoon, who at the time was fucking with his heart. So yea, this whole situation sucks.

i think youre so sucked into haesoo's self-victimzing narration that you dont realize how much pain he caused joowon throughout this whole series as well LOL. and yet joowon still stuck by him and supported him and showed him unconditional love and sacrificed a lot for him. he was abandoned twice by haesoo, and yet did he ever leave haesoo's side? even when haesoo blamed him for the losses in his life and told him to his face that he liked taku? not at all. so no, joowon was not "fucking with his heart" lol. joowon has genuinely loved haesoo since the start. also joowon actually did the things he did in the past with good intentions thinking that keeping their relationship ambiguous would "protect haesoo/their relationship", but it caused unfortunate misunderstandings and haesoo to get hurt. for that he changed, and repented and apologized. yet haesoo should be apologizing just as much as him.
about the sibling thing: they were related for barely 3 years, nearly a decade ago. the truth is they are not siblings and can be together now. they never saw each other as such when they met. thats why they fell in love. yeah there is mild taboo due to those 3 years: but again its a very morally grey situation and frankly people shouldnt read the story if they can't handle that. it's established literally in the first couple chapters + is in the description.
also taku was manipulative as hell towards haesoo and never once wanted haesoo to be happy the way joowon did. he needs to pack up his bags, and realize that entering a relationship with manipulative intent isn't right, and neither is constantly being selfish and using your partner's hurt emotions. he should be better for whoever he dates in the future.

Oh yea I also forgot about how Haesoo also fucked up. I forgot about that till you said that so thanks for clearing that up. But in the end, being together brought themselves pain because they couldn't understand what they want. You could say they wanted each other(Jowoon and Haesoo), but being in that relationship was bad on both sides. And yea same with Taku, him trying to be with Haesoo so soon after the breakup[? I dont even really consider them to even be dating when they were like friends(?) with benefits(but this still brought pain)]. There is also things that Taku fucked up on but still, everyone needs time to recover on their own. Whether one of them gets together in the future or not, I just want them to have time to themselves and realize their faults and grow from them because clearly they cant continue this.
At first, I read this for shits and giggles because I heard from Crunchyroll that this was going to get and anime adaption and thought how this guy's ass was going to get destroyed BUT this story is honestly really good ٩(๑❛ᴗ❛๑)۶ Like the sex is there AND development and their dynamic is so cute!! I wonder if the stars will give them any luck to impregnate Kouichi
i found the anime adpatation the other day....