Help looking for manhwa

The story follows a girl who is royalty or of high status. Her father forces her to keep a slave as a pet, she refuses but eventually she decides to give in. (I believe she already knows the future, probably because she gets isekai’d)
So she picks a specific guy to be her slave because she knows he’ll be powerful. She’s the only person in her family who doesn’t torture the slaves. I can’t remember the rest of the story but they definitely fall in love.
I remember a different Royal member having a slave and that slave was also in love with the mc.