The True Heiress Is the Supreme Priestess

After completing a dragon-slaying trial, Elena, guided by the Goddess of Fate, returns to her biological family. Forced to substitute her hypocritical adopted sister in a marriage to the cursed William Forrester, Elena uses her magical powers to cure him. She ruthlessly slaps the faces of her abusive family and scheming sister, reveals her true identity as the High Priestess, and chooses to stay in the mortal realm with William.