Lee Heeseung is an immortal creature, an alpha werewolf from the kingdom of 'Walst Noir' who is very cruel and cold. But one day, he was captured by humans and locked up in a research place.

While you are a young researcher at a company, you are observing mystical creatures that are captured, until you finally research one of the big gray wolves in one of the cages, that's Heeseung.