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. “I wish legendary detectives would appear and give me a clue about the case.” Feeling frustrated, he visits the old vinyl house where he once lived with his parents… There, he finds a book that belongs to his father. When he opens the book, what appears before Hajun’s eyes are legendary murderers? Wait, why are you here?!