Yes, especially he lied to taejoo. Their relationship even started with guilt, taejoo feels responsible for what happened to them. Youngwoo manipulated the emotionally unstable taejoo at that time. Now taejoo has the room to thinka about his last relationship not just burying it like he did when their in this relationship.
They all literally did things that were selfish and based their relationship on what was selfish or carried on a relationship based on selfishness. Youngwoo knows his relationship was insecure and taejoo is ignorant of it now but he also used him to get over yoon. That was he nature of their relationship and taejoon didn't want to admit it until yoon came and saw him with someone else. Youngwoo started to act out (wrong of him but I don't hate him) against yoon and then stated to admit it was because he was insecure. Taejoo wouldn't tell youngwoo what he was feeling and couldn't admit that he needed time apart. Which is natural because he hasn't actually moved on yet... just to another relationship. Yoon then used kwon to get over taejoon and move on... he would make decisions on his own too. Kwon wants to selfishly care for yoon but also keep themselves distanced with a time set sex partner relationship. Doesn't make sense. They all have their own shit. I think readers would want to see them favourably anyways and blame youngwoo anyways.... hes also younger than all of them and approached taejoo because he liked him and dedicated his time to taejoon and it must have hurt that it was about yoon. Being selfish isn't wrong but if it affects others it does and i think this story shows different kinds of selfishness with love.
Yes, people are selfish, but it's so messed up to do. If you truly love someone you would support their happiness, like they could have stayed friends, if you feel insecure and become toxic with jeolousy that's on you, don't make others suffer. Also I admit I am MC bias, he was so toxic to him as well and basically blames the uke, when he did absolutely nothing wrong. I stand by my fact that he was insecure and took advantage of the guy and that is wrong, selfish or not some people are not that selfish, there are good people.
Yeah i agree. I don't agree with what they all do at all and it's frustrating but i feel like with this story I personally cannot bring myself to hate them. I more so feel sad and i root for the main couple more but i feel like it will take a while for all of them, which i think is a good thing because they all need to sort themselves out tbh.

There's really no blame but also all 4 of them have selfish sides when it comes to love. They're all going through their own pain that couldn't be helped