The Arrogant Third Young Lady's Turnaround from a Useless Talent

Tear off that beautiful mask of yours and let everyone see what kind of trash you truly are! The legitimate elder sister is vicious? I'll slash your faces and break your limbs, so you can see what true viciousness looks like. The father is heartless? I'll sever our ties; if you provoke me again, I will destroy you just the same. With a single imperial decree, she is married off to the "sickly" Prince, who is rumored to be a man who drinks blood and eats flesh. A "sickly" Prince who drinks blood and sucks bones? It doesn't bother this young lady, and she certainly won't cause him any trouble. She only wanted to focus on curing her long-ailing mother, but she unintentionally became embroiled in a storm. She fell upon him, and as a result, she ended up with a little one in her womb. He, the leader of a mysterious organization, is cold, sinister, and kills without mercy, yet he falls for her at first sight. But who could have known that on the wedding night the man was looking forward to with great joy, the woman would actually run away with his child...