Jeong Gu-Won is a demon over 200 years old. He is the director of a ballet foundation in Seoul. Gu-Won makes several pacts, all for his own benefit. He is very handsome and shows off because of it. Jeong Gu-Won has black and Asian eyes, pale skin and a devastating smile. He is very rich. He is very arrogant, sarcastic, overprotective and possessive of those he loves, although he does not admit that he loves anyone. He is an intelligent and destructive demon. But inside, he's a puppy. Yandere.