Maybe to clear the misunderstanding that her brothers really do care for her? I think reliving and changing a few things will make her realize, since her brothers are more likely to share their true emotions if they are younger.
So why didn't that happen in her first life when they were younger then?
I don't know, it still feels weird to me. Probably because Hari was adopted to replace the younger sister and she resembles her to the point that they look identical. So even if they're not related, her playing the part of the younger sister and resembling her kinda makes it awkward if she does end up with the older brother.
Hmm I think they don't look alike that much, just the hair color is the same(and even then it is said that it's not the same shade). I also believe that the younger sister probs had blue eyes and looked like the 3rd brother. And anyways he didn't like her from the beginning or because of her appearance, but because of who SHE is and how she behaves. In the past life(spoiler) it seems that they liked each other but didn't want to admit it and both had a lot of regrets(I think that is why Eugene couldn't come to her wedding and give her to fiance AND why the time reset). Soo yeah the ending ship might not suit everyone but the story is really well made.
Oh yeah and they never saw each other as brother and sister, so I like to think that they are more like childhood friends and that they had that type of relationship more than the brother and sister one
So she went back in time so that she will end up with the oldest brother instead of her fiancee and I dont think this is really incest?? Yes, he's her brother but they're unrelated.
Why else would she go back in time for anyways, so this has to be the plot.