No one remembers when it was the first time to see a monster in Seoul, Korea. Also nobody remembers who was the first to meet an angel here.

Now, a new job called Hunter seems promising.

Yoo Jaya, who lost his parent by one of the monsters was able to survive by the help of the Arc-angel , Metatron.
Metatron saves his life twice- but the consequence was the shortening lifespan of Jaya.

Jaya and Metatron re-start to take revenge of the monsters!