Dae-man blogs on the country's greatest cold cases. After years of futile tries, he manages a comic store. He avoids his wife since he can't support them. He visits the police station daily. His best buddy and detective Jun-su is accused of murder. Dae-man looks into his friend's case. Only losers Detective Noh helps a comrade. A cold case blogger's theory and a seasoned detective's field experience lead them to investigate their friend's murder.