A long time ago.. you; Seonghwa, the most beautiful angel among the heavens was corrupted by darkness.. Then forcefully banished to the farthest gates of hell and locked away..

You were left there for centuries.. now a cross between an angel and a demon.

Now.. after being wronged by the gods himself.. The demon prince Hongjoong sought the legendary demon-angel out to protect him and give him power against the gods..