Exactly this. I had liked how they had started to “get along” in their youth and I hoped that they would band together or mature :P
You are right. It seems the only person who has a tremendous degree of change is Hajin with a great backup to support the change while the others have changed but with poor backup/story on why they have become like that. I don't like how Junghyun becomes the typical obsessive villain here.
Glad I'm not the only one. I didn't need the angst.
I'm disappointed with the direction this Manhwa has taken. I kinda wanted to see the two ML’s develop a genuine friendship and explore the dynamics between them. I wanted to see real character development rather than resorting to the cliché of making one male lead irredeemable to elevate the other.