Park Jaehyung has a normal life as a student. If you ask him he would say it's actually boring. He always wished that something about his life would change, make it more interesting, make it better. But he never thought that getting a new classmate would actually change his life in so many ways that he would even find himself wishing his old, boring life back. Kang Younghyun is a demon who doesn't want to be one. He tries to live his life like a normal person, ignoring the orders from hell and just trying to be normal. If he knew that moving back to South Korea would destroy his life as he gets to meet people who hunt demons like him and people who are wanted by the demons from hell he would have never moved back.