The Tyrant's Sacrificial Bride EP 14

Cursed Prince Leon hijacks Elena's wedding to mate with her, as only her bloodline can cure his fatal curse—but it will kill her. Deeply in love, he secretly bleeds his heart for an elixir. Tricked into thinking she's just a cure, Elena despairs and "dies." She returns years later with hate. Leon sacrifices his life for hers. Truth revealed, they reunite a millennium later.