Growing up in a world of monsters and angels, Yoo Jaya learns from a young age that there's no such thing as safety. Now, he makes a living as a Hyena - a scavenger for monster parts - but an unpleasant prophecy from an angel puts a time limit on his survival. It seems like his only hope is the one who gave him his powers…the noble archangel, Metatron. Finding her is said to be impossible, but he has to try! And so, Yoo Jaya’s unforgettable adventure begins.