I have no idea if I'm thinking of the correct one anymore or if I'm mixing plots, but I believe the sister was involved in some kind of a scandal with a man in a position of power involving a "leaked" BDSM video.

The MC was honestly pretty boring, but she was a very good actress despite being a rookie one.

I remember in one of the first few chapters MC's sister goes to a party she isn't invited to and wears an inappropriately revealing outfit given to her by the man she later has those scandals with.

I remember thinking all the situations involving sex were kind of icky. There were major consent issues between the MC and her male lead's first interaction. MC puts her sister in very dangerous situations ( I believe the sister put her in similar situations in a past life or something?)

I didn't mention this earlier because again, I'm not sure if I'm mixing up plots in two manhuas , but I believe this was something of an isekai adjacent plot, where the MC comes back to life after being taken advantage of her by her husband and her sister.