The FL knew her strengths and weaknesses well. If her sister wasn't up for the challenge, they both could have given the house to someone else. I'm sure the FL wanted to have a normal life, and everything that goes with fame and contribution to society was not what she was looking for. She did only what was necessary socially, and helped the people she could. She's perfectly normal. I wouldn't say she's exceptionally great or horrible. And I love that about this character. In addition, the roles are completely shifted in comparison to normal webtoons, in this one, the guy is having all the mental misunderstandings and stressing out while the MC is very chill. I can relate to the main character very well and her decision flaws are what makes her character: she never really freaks out even if she made bad decisions or if something is a bother which is part of her personality. I don't really feel bad for the younger sister of the MC because, in my opinion, she always had a way out. She gave MC troublesome things in return when she became Empress. I had a really bad feeling about her, but now I hope that the future drama is from the ML's side like the classic reincarnation stories, and the sisters remain strong together. I live for this type of small change from regular reincarnation stories.
The Duke of Ashleyan’s Contractual Marriage