The Devil Dragon's Substitute Bride / Revenge of the Shadow Bride

To save her terminally ill sister, she’s forced to marry the feared Dragon Duke in place of her selfish cousin—a man rumored to devour his brides alive. But behind the terrifying legend hides a breathtakingly handsome ruler who treasures her beyond imagination. As she rises from sacrifice to duchess, her jealous cousin watches in horror after marrying the “perfect” man she once chose, only to end up trapped in a miserable life.