According to FL, before she reborn, her eldest sister marry the ML, became empress, and had a wonderful life + healthy children. Come tell me how? Her eldest sister is rude, impolite, one dimensional original Cinderella step sister character. How so, huh? To what reason would ML marry her in the previous life path?! Then proceed to crown her empress. My intelligent is being tested here. Even if the family use some kind of treasure to force the marriage - to crown her empress + have children, the family better have a very strong grip on him which I find hard to do so (ch 2 - he critic the sister for telling people he had asked her to dance when it was actually she who had asked for it. A guy like this marry a woman like that in the previous plot line? He must have lost 2/3 of his brain before he had married her.) And who wouldn't say, if he marry her sister in the original, what make her think he won't this time? To better understand why she is so confident, we need to understand the reason why in the original storyline he married her sister - but it wasn't even mention and yet she had absolute confidence of his character and that he won't go bunker once he knew of the sister.