Soonam lives his life completely unaware that he is a beast. One day, when he becomes the target of a runaway beast, Siyeol ends up saving him. However, the surprise is short lived as Soonam 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, Soonam and Siyeol end up working together…