
"Joowon also leaves Haesoo and comes back all the time because of his job, but never acts like it's such a big deal".
Ok I have to say your argumentation is rather inconsistence. Once you blame him that he act as jealous bf when he isn't. Once you blame him he doesn't act like bf... Although he isn't?
He had a job? Even when you are in relationship you have to sometimes go abroad for job?
What's more he was the one who contacted Haesoo, visited him. Not the other way around. The one who stayed in touch and showed affection was Joowon.
Of course he made mistakes, has his fault. I just talk about his positive aspects. Don't get me wrong.

I literally wrote "abandoned". In Joowon's mind he was abandoned because he believed if he loves Haesoo and Haesoo loves him they will be together forever. Selfish and naive point of view. But he thought love was enough and they will always stay together. As he said for him Haesoo is his soulmate.
Probably he wanted at some at some point to developed their relationship. He bought the ring.

I was making a point that Joowon is using a common manipulation tactic. He got jealous and used Haesoo to his advantage (and keep in mind that he IS aware that Haesoo likes to get on his bad side and make him jealous), then he leaves and acts like nothing is wrong. He might not have known it until after the split, but that hurt Haesoo a lot. Joowon should have made it clear what his intentions and feelings were long before.
Please also know that I don't hate Joowon. I would just never be in a relationship with a person like that. Every human has their faults and makes mistakes.

"He got jealous and used Haesoo to his advantage (and keep in mind that he IS aware that Haesoo likes to get on his bad side and make him jealous), then he leaves and acts like nothing is wrong" - I'm not really getting that part. How he used Haesoo to his advantage, can you explain?
And I have to disagree on "Jowoon" being the only one manipulative in the relationship because, to me, both of them silently created these weird rules on how they should interact. In the beginning, Haesoo straight said that most of the things he did are just to hurt Jowoon. He was jealous, angry and filled with darks emotions out of the belief that Jowoon could replace him and live his life like it was nothing. Haesoo lied to him for most of the story and didn't even give Jowoon the chance to realize he was being "abandoned". Don't get me wrong, Jowoon also hurt Haesoo a lot but I believe that both of them were hurtful in their own way and trying to point out only one of them just leave a big part of the plot apart.

To explain - he used Haesoo to his advantage by having sex with him after getting jealous.
Now, I'm trying to think as objectively as I possibly can here, I do agree that Haesoo is also at fault for this situation. I'm really trying to keep this between Joowon and Taku, as they are the two love interests to the main protagonist Haesoo. Of course it takes two to tango, it is both characters' faults for being in such a toxic relationship. I was merely pointing out a manipulation tactic that Joowon used. Haesoo also used one, as you said, he did those things to target Joowon and put him in the position to be jealous. They definitely use each other for sex and probably to just escape from the real world. But that does not change my stance on Joowon's behavior.

I'm sorry, but I am not reading this fully. The first thing you told me was that I have a biased opinion, and honestly, no shit. I'm a reader of a manga, I'm a human that has opinions, and I'm going to like the characters that I want to like, and not like characters that I don't want to like. So will you. Someone who is very strongly forceful with their views will never change my mind. Who cares if people comment with biased opinions?? That's literally what the comments are for, and what opinions are. I am not going to sit here and be patronized because my way of thinking is biased and "wrong". I said what I wanted to say about what I thought about the characters, and that's that. Thanks!
I seriously cannot believe that thid manga actually sparked such a big debate over which character is better, Joowon or Taku. While I'm here, I'm gonna give my two cents:
I think Taku is the better romantic partner. While he did lie to Haesoo, he's lied only once, and has been very protective over him while also keeping his cool. Aside from that, he always tried to console his past partner(s) but was always told that he was being insincere. Those are the only faults I can really see - he has been good and comforting to Haesoo, and he had always kept his distance from his models, but he took a special liking to Haesoo, so he acted on his feelings.
Joowon on the other hand... he told Haesoo to not have feelings for him, whilst throwing a jealous fit every time Haesoo didn't want to talk about his sexual partners. (It was never even his business anyway.) Joowon kept Haesoo in a mental state that didn't allow him to have emotional connections with his other partners, leading to further toxic relationships with other people (as this new protagonist is showing). He even got mad that his ex found out he was cheating on him, and HE dumped his partner... yikes. Joowon also leaves Haesoo and comes back all the time because of his job, but never acts like it's such a big deal. Then, oooo, all the sudden, Joowon is upset because Haesoo wants to finally move on.
HOWEVER... Joowon, in my opinion, is the better character because of his more in-depth storyline thus far. I think that might be the only reason why some people like him over Taku - attachment to character. I would love to see more about Taku in the coming chapters and learn his past so I could compare him with Joowon a little better.
Thanks for reading ! <3