This novel mainly tells the story of two male protagonists who encountered an unpublished case in high school. The first male protagonist was framed and was sent to prison for reform. The second male protagonist enrolled in the police academy in order to find out the truth and joined the police after graduating from college. The male protagonist, after serving his sentence, worked tirelessly to reverse the case and finally joined a well-known local detective agency after he was released from prison. Through their efforts, the two gradually had the opportunity to understand the contents of the case back then. However, the closer they got to the truth, the greater danger awaited them. .