What would you do if one day a magic book chose you? Are you going to continue using it ?? But, there is always a risk from everything we get for free, right? Are you sure you will be able to bear that risk? This is a relic of the Joseon era, whose existence is not written in history. Lee Jinwoo, Kang Seunghoon, Dong Mino, Choi Seungyoon and Kwon Taehyun. The story of the five of them is about to begin.