An action historical drama depicting the story of Joseon’s best swordsman Yi Nan in front of an irreversible fate.

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 cold-case enthusiast blogger and a washed-up veteran detective team up for a joint investigation to rescue their innocent friend who is framed for murder.