A comic book storekeeper, Dae-man, and the legendary homicide detective, Tae-su, who met on previous case quit their jobs to open a private detective agency.
A famous collector dies suddenly in Florence in strange circumstances. His wife, the only heir of an immense wealth, has a unpleasant surprise: the husband, a few days before his death, had spent 20 million dollars to buy a building in the heart of the Tuscan city. Why didn't he say anything to anybody?
Dae-man is a crime enthusiast who runs a power blog about the country’s biggest cold cases. He aspired to be a homicide detective but after years of failed attempts, he now runs a comic store. He walks on eggshells around his wife for failing to provide for the family. But he cannot help himself making daily trips to the police station. One day, his best friend and detective, Jun-su, is charged with the murder. Dae-man sets out to investigate to prove his friend’s innocence. Only the washed up Detective Noh offers to help his colleague in trouble. A cold case specialist blogger’s theory coupled with field experience of a seasoned detective and the two launch a joint investigation into their friend’s alleged murder.