I think he's know where this is going..

Every chapter I read this I think "so how are they going to break up" because with one of the main characters being lonely as shit it's obviously not going to end like this. I hope it won't be disappointing anyway.

I'm pretty sure the story ends pretty soon (based on some of the comments here it's actually in a couple of chapters), so it's doubtful that Hyunwoo is going to be end game. There's reasons for it ending early and apparently there's reasons for why she chose Hyung to Subin's lover, but it's in a lot of topics/comments if you look. I personally wish she had kept with Hyunwoo, oh well.

it didn't end early, the author did plan for the story to have at least 40 plus chapters lol

Even if she meant for it to have at least forty chapters, it doesn't mean she still didn't end it earlier than she intended. I'm basing this on many of the comments I've read on here and on tumblr, and from what I've gathered this artist is one of many who is deeply unhappy with Lezhin and their business practices. The abrupt nature of this ending seems to indicate that this dispute with Lezhin must have played some small part in her decision to end the series so quickly. Many people have claimed that At the End of the Road was also affected by the Lezhin affair as well.

Tbh, I feel like that too. I can actually see the Subin feels they are not meant for each other and then breaks up with Hyung just like you said. And it scares me very much T^T I hope both of our instincts are wrong.

I hope you're wrong.. "When two people are dating, their respective needs are met through a mutually beneficial relationship." What Subin and Hyunwoo had wasn't mutual at all, it was just one sided chasing. I was hoping this quote was for Subin and Hyung's relationship.