i honestly don't mind the pairing of rin and daikichi. the fact that he's much older and her foster father doesn't rock my boat. plus, he actually waited until she graduated and placed her above everything else by making sure that her love was one of romance before preceding. my only complaint is that the twist was rushed to the point that it just didn't sit right. i mean, before the twist occurred, the manga felt like it was building for rin and kouki with a very shoujo atmosphere but once kouki fucked up, rin concludes that she loves daikichi?! it didn't seem like there was any romantic tension nor interest at all between the two before the twist! i only wish that the mangaka chose to develop them more as a couple instead of a last minute get-together.
spoiler
as tragic as death is in any case, if I had to pick the lesser of the two evils between Jaehas and Yoenhos deaths, I think that being Jaeha in the first ending (not the alternative one) would be heartbreaking. not only did Jaeha wait 10 years thinking and hoping to whatever god up there that he'll somehow meet Yoenho again, but he also witnessed the same person die right in front of him without even being able to speak a single word to him first. I mean, as Jaeha pointed out, 10 years is a long time for him and Yoenho can't object because he spent 10 years without remembering Jaeha much (and potentially hoping to forget about Jaeha altogether). so, in the end, Jaeha was given hope for a better future and then had it dragged out of him and crushed right before his eyes when he saw Yoenho again. plus, I am positive (knowing Jaehas personality) that hes blaming himself for what happened. hes blaming himself himself for not dying 10 years ago because now he believes that he caused Yoenho to die in the end. Yoenho regretted Jaehas death because of something that he didn't do and things that he didn't say (or said instead) while Jaeha blames himself for something that he believed was a direct consequent of his actions in Yoenhos death. I would rather have this experience of connecting to the past be something that helps Yoenho get proper closure, instead of something that places Jaeha in such a position. like I said above, having neither of them dying would be one of the better endings, however, if I had to choose who to be in this scenario, I would not want to be Jaeha. regardless, this was an amazing manhwa and something I will keep coming back to in the future!