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I'd say the parents are the root cause for all these happenings. If they were treated fairly, none of them wouldn't end up that way. If the younger sis were to receive the ribbon, the older sis might have felt the same. Or if the younger sis were the smarter twin, the older sis could be the depressed one. Since the parents were so discriminating, the weak one end up destroying herself.
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What I like about pornhwa is that I actually go for the plot.
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Pornhwa are new but more reliable form of manhwa but in pornhwa is called like hentai or adult manhwa.
https://www.mangazuki.online/
I don't think he tried hard enough. Or more to the writer really focused on the main seme and he was written not really consistent. If he went far to work with the uke, he shouldn't be passive after confessing to him. The uke shouldn't be left alone at critical times. It's natural he would go back to his (ex) lover. Not that I shipped them, I just don't have objection if they end up together because the tanned seme has wasted his chances.