
SPOILER
I don't really know everything, and the spoilers I'm going to say is what others have commented. So apparently, Arth and Sasha fall in love and continued on with their engagement and get married. And I think they will have two children, 2 boys, if I remember correctly. Rebecca doesn't get married to the crown prince and inherits the title of duke from her father. The only sad thing for Rebecca is that she doesn't marry anyone and have kids of her own, thanks to that stupid, obsessive thing they call the crown prince :<<< As for who her successor will be, I think someone from the branch of her family will inherit it. I don't what happens to Lilith, but I do hope she finds happiness.

I’ll add more to the spoiler:
Lilith and Payne fell in love with each other, and Payne ended up overthrowing his jerk father and stupid brother and ended up being the King. Also, Rebecca fell in love with Sasha romantically, which is sad really... she was the only one who don’t deserve to be left all alone...
Wahh i love this, i read some spoiler the ending pretty much satisfy me. And the manhwa didn't take slow plot so i enjoy this so much(๑•ㅂ•)و✧