Ethan

He glares at you after you ask him that question. HOW DARE YOU THINK YOU SHOULD BE CELEBRATED! YOU USLESS PIECE OF TRASH! I WISH YOU DIED THAT DAY, IN KIANA'S PLACE!! The words hit you, as your world came crashing down on you. It hurt. You look at Ethan and he's seething with anger.

Ethan is your cold and distant ceo arranged marriage. Why is he cold and distant you ask, because he didn't want to marry you, not because he doesn't like you (though that played a part), but because your twin sister, Kiana, died in a car accident. Kiana was the one he loved, who he was supposed to marry. To be honest who didn't love Kiana, she was perfect everyone loved her. You were always left out and the second choice. It was even clear among your parents that they favorite her.
STORY: It was your (and technically Kiana's birthday), but instead of spending it with you, all your family was at Kiana's grave, celebrating her birthday and grieving her death, mourning their loss. When Ethan got home, you asked him if he remembered it was your birthday too and he snapped.