From my perspective i was always team jung, i don't think he is an angel he has his fair share of bad traits but i wouldn't say he is a jerk just like everyone else he has had experience in his life that caused him to turn out like this. In the last few chapters you get to see a bit of his vulnerable side.
If you want to know what happened to Ihno i can tell you. Spoilers
I haven't read this in awhile since i finished it when the author did but from
What i remember and from re reading
the last chapters he doesn't end up with seol but i think he is doing better, he left Seoul and went somewhere else and he got a job playing piano for people at a restaurant and he seems happy. His relationship with jung ends in a sought of fight.ヾ(❀╹◡╹)ﾉ~ hope that helps
Okay, so honestly, I loved this and its complexity, probably one of my top romance+psychological manhwa/webtoons, but Im ashamed to say that I don't want to read the last 50 or so chapters because I know Inho isn't going ro get what he deserves. I might have the worst case of second male lead syndrome ever, but even if he didn't win in terms of romance, I wanted something to be better for him, like a fix in his relationship with Jung (yeah that unrealistic of me) or at least him being part of her family because he needs that type of happiness in his life. I mean, I was pretty much team Jung when Inho came in, amd then even though Inho is a better person overall, there wasnt a team Inho because MC is really truw to her first option lmao. Rather than a #teamInho, its #justicForInho. But it looks like he and Jung can never get along, mostly because Jung is a jerk and psycho, and I can tell from comments that we don't get to see much of Inho's future or ending and thats just sad.