TBH I found the uke extremely selfish. I think the best description of his character is given by his ex wife as person whose top priority is himself. I'm not saying it's not right caring about oneself. But it's also not good when it seems like he only cares about himself. In this webtoon because trauma Jaeha hurt three people who really loved him. I didn't like in the end when Eunho asks forgiveness for not taking Jaeha's situation to mind when Jaeha actively refused to share and communicate his feelings and thoughts, to a point where when he DOES share his past Eunho is scared and runs away thinking everything is over and that Jaeha is doing so because he hates him.
I think, by now, we have grown enough, and read enough, to know that trauma does not justify hurting others. But Jaeha gets everything forgiven because sad backstory . I'm happy the wife and the sex friend were able to move on. I just wish Eunho didn't have to take the burden of this guy who keeps saying "If I run away, chase me"