Reborn as a woman in a superpowered society: My father remarried and gained an older sister.

(A sweet, non-toxic slice-of-life romance novel with no supernatural elements) Gu Qing is reborn into a seemingly real but actually strange urban world, where everything is just like her previous life.
But the biggest difference is the reversed gender relationship. The woman is in charge of external affairs while the man is in charge of internal affairs; the woman marries the man, and the woman is also required to pay a dowry.
With my father's remarriage, I suddenly have a beautiful older sister, but she seems a bit dull-witted. And why does she keep staring at my feet...?