Su nam lives a life oblivious to the fact that he is a beast. One day, when he becomes the target of a runaway beast, Si yeol ends up saving him. However, the surprise is short lived as Su nam is brought before the elders who is in charge of the beasts. He is turned into bait for the beasts. When a suggestion is made to solve the case of the runaway beast, Sunam and Siyeol end up working together…