The Blood Contract: Princess's Revenge

Evelyn, the vampire empire's sole heir, once saved a human named Damian by giving him immortality and secretly ruling beside him as his wife. On his coronation day, Damian betrayed her, publicly bonding with another woman and having Evelyn beaten to death. She resurrected, reclaiming her ancient bloodline. She stripped Damian of all her support—his lands collapsed, alliances shattered. At her coronation, King Vlad III revealed her as the true heir. Damian finally understood: he had thrown away the vampire throne. Evelyn took back her blood bond, turning Damian into a dying old man. She then married the awakened ancient prince Valerius, ascending as queen.