An angel has been so curious with what the humans' world looks like. He badly wanted to go to that world since he was young, but there's a golden rule that was applied in his own world. AN ANGEL IS NOT ALLOWED TO SET HIS FOOT ON THE HUMANS' WORLD UNLESS GIVEN PERMISSION. And that permission takes almost everything to have. But the Angel took the risk, and made his journey until met someone. And that meeting will change both of their lives.