
Honestly, I'm more interested in them as individuals than any relationship they have or could have. Seriously, I still don't know why the "Romance" tag is here when at any point I felt Yuri and Sunwoo saw the other romantically and tbh I kinda don't see it happening. What they have it's an interesting way of showing "sympathy" to each other when none of them really know how to, especially when they don't even understand how to manage themselves. By no means this is healthy but it's definitely better told than many other stories that straight-up make abusive relationships or mental illness look like child's play. For real, traumas normally are handle as little things that disappear the moment the characters find "compassion" in others or forget any abuse they could have been victims of.
Is Sunwoo less depressed now that he is looking up for Yuri? Nope. Is Yuri managing his anger issues better now that Sunwoo cares for him? Not all. Any of their problems magically disappear with them getting close? No, in fact, I think there are more. The wrongs they did to the other don't matter anymore because Yuri seems to accept Sunwoo's help or because Sunwoo regrets it? No! Realistically speaking, besides the unnecessary sex scenes (those moments really feel odd for me), their dynamic makes sense.

if yuri has an anger issue and speacially abusive behavior, I think, it appears just for sunwoo and it is really disturbing for me, so ı don't see his problem as a mental issue he is just a bitch. On the other hand, you are right about sunwoo I mean he is in depression and it will not disappear when a new interest comes so that it is reflected realistically

I kinda agree with your perception of Yuri, even tho is hard to believe that someone who suffered from family neglect and abuse didn't become a product of it. It's absolutely right that his abusive tendencies are targeted towards Sunwoo, it doesn't matter that he started to have a real interest in him as a person or that he not resent Yuri. Honestly, I would forever love this manhwa if Sunwoo seeks real, professional help to move on and Yuri gets a real punishment for his actions, plus the realization of the damage he has done in order for him to deal with his problems.

It's kind of funny how Eren's mastermind plan "I make myself believe this happened, but it didn't actually happen because I made this person think that this other thing happened to make me believe it happened, but it didn't happen because what really happened is what I did" makes more sense than him being in love with Mikasa.
Ah, that kiss was so casual and realistic that it hurts. This proves how it's possible to write a moment of intimacy between the protagonists without the need to create a situation so fucking embarrassing that can only create other equally painfully embarrassing situations. A masterpiece.