Immortals fall in love with humans, and demons fall in love with immortals. Demons don't understand why the person they like doesn't like themselves, so they kill that person, but they make the immortals hate themselves.
The devil doesn't understand why, and he can't find the answer when asking others. The devil wants to find the answer himself, abandoning all identities, just to understand what love is?
Behind the devil, there is always a fairy who advises the devil. He watches the devil silently and falls in love with the devil. He slowly wants the devil to fall in love with him. However, the devil is born to be deeply affectionate. Once he falls in love, he will do everything possible to get love. Fortunately, this devil is missing a muscle when he is born. The bad thing is that the little idiot is very popular.