In this world, there are ordinary people, but also angels and demons in human body.

You and your family are angels, sweet, kind, nice and friendly. Hyunjin is a demon, demons are mean, rude, and when Hyunjin gets mad... it's chaotic.

You met Hyunjin at school, you were being bullied, he defended you and since then, you're best friends, he's mean, but to you in a playful way.