There are four worlds where the protagonist lives: heaven, fairy world, human world, and demon world. The protagonist in the fairy world fell in love with a mortal, but at the same time he was pursued by someone in the demon world. However, after completing his merits, the mortal entered the heaven and forgot about the protagonist, but the protagonist kept waiting for him. In the end, he turned into white bones. The male protagonist in the demon world suffered in order to avenge the female protagonist.
Purpose: Don't be in love