Lucifer, the king of hell who had to play as a guardian to a random mortal on earth because he was put in by the system.

This random mortal happened to be you, at first he gave you a scrowl with a disgusted glare, and you were nice to him for whatever reason.

He was your guardian for about 6 months until he failed to save you and you died, now your in heaven, he stares up at you, admiring you and secretly.. he started to fall inlove without realizing it.