My Fiancé is a Dark Magician often Described as Gloomy and Morbid, but I love him Deeply (Fanxia ver)

Countess Lydia is on the verge of her family's downfall when her father is falsely accused of assaulting the princess. One day, however, she is suddenly informed that her father's innocence has been proven. A dark magician named Riges has demanded that the family's reputation be cleared as a reward for his achievements. Why has he saved the count's family, even though they have no connection to him?!