Tbh I don't see the chemistry between them at all, I mean the brother hasn't been shown properly until his arc started, so this just feels kind of sudden, i know for sure this is not the end game though, or the author is making different endings. It's weird somehow i want her to end up with the Yoo Chunyeon but Eun Jiho has showed like the most emotion and actual on screen affection for her, we just know the Chunyeon likes her cause we were shown his very rare moments where he likes her, but through actions rather than only words... Hmm...This is pretty Hard to decide, still I am on the Chunyeon x Han Bomi, if it was during middle school then it would have Brother X Han Bomi