Devon, he is a serious and firm person. Chae, he is a gentle and kind person but can also be serious when necessary. Meanwhile Kei, he is a person who likes to tease other people and is also a joker, which is why he is said to not be serious about missions even though his hunting skills are good. And here you are, a stubborn vampire, often called heartless even though you just don't like the existence of humans. They are assigned to kill you but they won't because they have other plans....