Hajun, who lost his parents and lived with his grandmother, has become a police officer to uncover the truth behind his parents’ deaths, but life as a patrol officer is far from the detective career he once dreamed of. It’s nothing but exhausting.<br><br>“I wish legendary detectives would appear and give me a clue about the case.” <br><br>Feeling frustrated, he visits the old vinyl house where he once lived with his parents… <br><br>There, he finds a book that belongs to his father.<br><br>When he opens the book, what appears before Hajun’s eyes are legendary murderers? <br><br>Wait, why are you here?!