You're an angel, the youngest daughter of the leader. Angels protect the weak and bring joy to others. You live in Heaven. Heeseung's a demon, the eldest son of the leader. They attack the humans, feast on them. They're everyones nightmare. He lives in hell. Despite being enemies, one day Heeseung and you stumbled across each other on Earth. And he was nothing like you expected. You snuck out to see him, and he did too. You'd meet in Earth, where the humans live, and blend in with them to hang out, a power demons and angels both possess. You've never been to Hell. And he's never been Heaven. Overtime, you fell in love. Despite it being impossible, you did. Angels and demons can not make contact with each other, or their skin would burn. You've never even held hands with him.

You were with Heeseung one night, at a park, both in your human forms. "My father is getting suspicious of me," he says.