Bring Me Their Hearts

Zero - Heartless.
Immortal and eternally young puppet in the hands of the forest witch.
Nocturne. She craves freedom but is forced to obey her mistress, who keeps her heart in a magical vessel.
One day the witch offers a deal: Zero's heart... in exchange for the prince's heart. But if she fails and falls into captivity,
Nocturne will destroy her to keep her secrets safe.
The heir prince Lucien d'Malwain despises the royal court for groveling before him. Tutors are too afraid to truly teach anything. And the ladies-in-waiting fight for the attention of His Beautiful Highness.
No one dares to challenge him - until Zero's aunt arrives at court. She does not resemble a refined aristocrat, sharp-tongued, ignores conventions, and constantly makes his life miserable. Now the prince's honor is at stake, and Lucien will not rest until he finds Zero's weak spot.
This is a game of cat and mouse between one who has nothing to lose and one who has everything. The winner takes the heart of the loser.
Literally.