I recall a little but of the plot but hopefully its enough for you all to help find its also i think quite popular aswell!
A Dukes daughter and was trying to stop a engagement from the crown prince becuase she realized all she needed was money and I also think one of the Love interests can Shift into a tiger and was bought off a slave auction.
Hopefully this is enough to be found!
Seolhee and the guy are so cute I want them to end up together T_T