
Maybe it’s because i binge read this while being tired, but for me I never realized when Soohyun‘s acts for revenge turned into acts of affection. Like at what point does he get feelings for Eunsung. I might have looked over some points, because at the end of the story it’s clear they love eachother, but the development leading up to this point was vague for me.. Can anyone explain?

He was always in loved with him but he mistook those feelings for inferiority. If you read closely you can see Soohyun is actually a unreliable narrator (like the idea that Eunsung was just as messed up and manipulative as him, which is not true)
He was obsessed with Eunsung, at first he only wanted to beat him but he slowly started to stalk him, buying the same things he did, sitting with him
When he comes across the news abt Eunsung he thinks that he wish he was the one that bringed that side of him out and starts obsessing over him again to the point he changes careers just to be able to get close to him and his whole scheme of getting revenge "for him" was only bc he wanted to be the only one to see Eunsung being "ruined" and the old man took that way from him
Let's just say in his own twisted way he always wanted to be the closest to Eunsung and have him all to himself, as the story progresses Eunsung starts to develop feelings for him too. Tbh I think their relationship develop in such a smooth way that there's not rlly an exact moment where he changes, it's just a gradual thing

I wish there were more chapters from Heejae’s point of view, because I don’t understand when he decided to not take revenge on Seyeong anymore? He didn’t act that different the whole time he was with Seyeong irl, or did I just miss that development?

Same thoughts! When i first read it, i was confused if the author just forgot or maybe they didnt want the story to go longer cuz i can definitely see heejae chasing seyeong all over again if he did his revenge.
So I tried to reread some chapters and in chapter 41, HJ is already aware of his feelings for SY (based on the back story). So why did he thought of "keep it in, let's hold myself back one last time" and "you're so fucked SY" if not for revenge? If he knows he's in love, why does it seem like he still wants to exact revenge on SY. I want to think that maybe those lines should be interpreted as him thinking he's finally gotten SY and that he will never let go just so there won't be plot holes. But I really wish we had HJ's POV again to clarify.

This reply is coming so late but I just finished the series and am so obsessed with it!
I think that HJ saying he wanted to take revenge was just because he was mad and hurt. I’m not sure if ever really planned to go through with it. Like you said he never really acted any different because I think even if he didn’t realize it, he still liked “Sesam” and Seyeong. I mean, If you took away how they looked Sesam/Seyeong’s personalities were basically the same in game and IRL. HJ really started realizing it that time they were fighting out in the snow.
Also, it could be that his definition of “revenge” changed. Like instead of humiliating SY, he’d make him fall in love with him and be as desperate, insecure and possessive like HJ was… and I think SY did become a little like that in the end hehe
Read this because it had a high rating, but this was such a boring story? You have these two characters, and the only ‘thing’ they have is their jobs. Even with that you barely see them doing work-related stuff. No hobbies, no eventful interactions with other characters etc. MC’s only hobby was being a fanboy? And that was it nothing more. Same can be said for ML I think this dude is even more boring. The author’s art was nice but that was it.