Sungyeol was an angel that lived in the heavens above. But one day he broke one of heaven's rules. There is a punishment for every sin. Sungyeol's one is that he has to help 6 broken-hearted people to go back to life, as a human. If he succeeds, he'll become an angel again. If he fails, he'll die as a human and will burn in hell forever...   What will be his destiny? Where will he end up? Heaven or Hell?