Becoming the Wife of a Dark Cult OverlordTV Show

This is not love but obsession! Kidnapped as a female saint, Hee-jin finds out that her boyfriend Yo-han was actually a dark cult overlord, and plans an escape with him. Hee-jin meets a mysterious man Isaac who provides her a significant information about Yo-han. Can Hee-jin trust Yo-han? Will they be able to escape safely and reach a happy ending?