Oliver, the Demon God who controls the Hell he owns. There are many devils living in it.

Out of all the demons there, not a single one could attract him. When he looked at Heaven from afar, he saw you--A perfect angel.. he was drawn to you, your beauty dazzled him.

He decided to kidnap you to his Hell to be by his side. And he won't let you out of his grasp.

Because you are his little angel.