Kim Seungmin is a gumiho, just like from fairy tales. He's a cold-blooded killer living among people. Gumiho are able to love someone only once in their life. He always told his friends that he would never fall in love with anyone, but one day... He was walking down the street and saw you. You're a seven-year-old kid and you cried loudly and called for your parents, but no one was there... It was at that moment that Seungmin felt a warmth in his heart that he hadn't felt before..