One of my favorite novels is called Hidden Marriage where these 2 girls were switched at birth and after they found out the one that was raised in a rich household actively sabotaged the rightful daughter. I have become hooked to those types and ones where there is a mean and malicious half sister that gets her just desserts. Does anyone know any novels like that?
The Yandere Came During the Night (historical) Perfect Fiancé (the sisters have a good realationship in this one)