Imo that's like rather expecting it to have ended in nothing which in turn leaves it not open ended... just because usually a sequel for it would 100% mean they end up back together cuz if not why even bother so really if suhc a sequel never comes we can assume nothing came of it. Ofc its technically open ended but it doesn't feel that way to me because of the way these stories work 99.99% of the time
╮( ̄▽ ̄)╭. I dont mind if they do end up meeting again and finally work out because honestly, it'd be nice to see for once a story where a shitty character doesn't get no redemption arc, instead they genuinely decide to change for the better and even get therapy or whatever (basically actually grow up and own up to mistakes and learn to love and communicate properly). I wouldnt call it a redemption arc for him because it wouldnt be coming out of nowhere. It'd be years until they meet again if they do, maybe even 10. The light haired dude, as his friend pointed out, had pretty much never been in a long term relationship before. They never lasted nor did he feel much when he was broken up with. Somehow, he did end up feeling a lot, tho complicated, for the asshole. Not only was HE the one to have to end things properly, he felt beartbreak over it. In that sense, I think it there is some potential. For sure right now it's impossible and not worth anything after all they experienced with each other, but a lot can happen in 10 or 20 years. I would just hope that one way or another, the red haired guy either 1. Learns to be a decent human and makes real friends in the US, maybe even meet someone special and gets over his first love or 2. He heals, makes proper friends, and stays a good person even if when he goes back to korea to try to restart a relationship with his first love he ends up getting rejected. That he responds differently than when he was younger and treats the situation like a proper adult and says his final good bye. If they do get back together, it better be fucking refreshing and pretty fluffy all around- no bullshit of old ugly habits but not in a way that feels like they arent even themselves anymore. In the way where you can really tell they each find something in themselves while alone in that time that everything hits different for them in the best way. (▰˘◡˘▰) those are the only 3 endings I'd accept regardless which way it would go in a sequel or even if it stays open ended.

Cos the guy is psycho, there's no need for them to be together. It should be left open ended