The adopted sister drugging the MC to make her sleep with the ML is quite possibly the dumbest decision I've ever seen in one of these manhwas.
He's her legal husband! If they have a kid, then you'll never succeed in your plan to take over the family's wealth because you just helped create a legitimate heir!
A woman sleeping with her husband on their wedding night is the single least scandalous sex scandal you could possibly create. Meanwhile, you just got caught in 4k sleeping with a blind woman's fiancee in secret!
