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?