
it looks more like a yw/hb endgame to me...but honestly with this manhwa anythings possible lol ive stopped assuming i know anything hahaha

I don't see pair Jumi and Heeb as confirmed yet. In fact, why show us all this YooWon backstory if he's gonna become irrelevant. I suspect the author is giving us backstory to prepare us for something (and that touching moment with the mother where we get some of his thinking re the HeeB break-up, where he's finally being utterly truthful, as he doesn't need to manipulate her at that moment).
HeeB is exploring. But YooWon may be evolving. We are gonna learn why he does things, what he's done in the past, how he became the person he is, and that may be to evolve him to become what HeeB needs.
Or not. There may be no pairing endgame. Everyone may learn lessons and move on. It does say "THAT SUMMER"--and we will be getting some info on the summer HeeB and Yoo hook up, surely, just as we got info the summer they broke up (this one, storywise). YooWon said to HeeB to him it's still summer. HeeB says summer is ending. That showed up HeeB's break-up mentality and YooWon's "let's stay together" thinking. BUT...there's always another summer, so I have not given up on YW and HB just yet.

It's a BL series though, so Jumi's definitely going to lose in the end. Otherwise it would be a non BL series with BL Subtext.
At this point I'm think Hee Bum x Jumi is pretty much confirmed, but I have no idea what's gonna happen with Yoo Won. I hope he'll get to reunite with Hyung and get together with him sometime in the future, but I think that's a bit unlikely. Whatever happens, I hope Yoo Won can get a happy ending, I really like his character! <3