Angels are not suppose to love humans and that's the rule from the start.Suho is Chorong's guardian angel,everyone adore him because of his ability and good look.He's one of the powerful angels in heaven but something unexpected happened. No one ever thought that the great Suho will broke the rule.What will happen to him? Chorong is a simple but beautiful girl,we can say that she's almost perfect inside and out but there's one problem.Chorong was so sick that it looks like she spends her whole life in the hospital.All Chorong want is to have a normal life,she always pray and Suho saw her desperation and good heart.