The issue that readers have with the ending isn't the fact that they didn't end up together, it's the fact how it was executed. When Dohyeok went to return the scarf, he was determined to let go of this feels then and there. Siwoo kissed some rando that he had 0 feelings for cause he knew Dohyeok was there. That wasn't necessary, like at all.
Do you know how many semes that are more toxic to their partner ended up with happy endings? Compared to what Dohyeok's done to Siwoo, it's tame. I'm not diminishing how wrong it was with how Dohyeok was trying to express his feelings or anything but if tops who are more toxic got their happy ending, then it's not unrealistic or wrong for Dohyeok to get his happy ending as well.
came here after i saw the raws spoiler, so basically they didn't ended up together well thats a good thing for me. y'll lets not push a happy ending for them when you clearly witnessed what had happened, it was the best ending for a toxic couple i mean its not like they've started with good things, the ending should be like that. he doesn't have to involve himself with him anymore, someone's happiness doesn't have to be with a person y'all know that. best wishes!