KIM Ho, the best swordsman in Joseon and the King’s guard, one day is being demoted to a prison and receives the order to keep the prisoners. At midnight, when he falls asleep, a riot happens and suddenly 5 armed men appear in front of Ho. They are coming for LEE In-jua, who has imprisoned on a charge of planning conspiracy, to keep him out of jail. LEE In-jua and 5 martial masters are planning to subvert the country again. Now Ho must fight with this pitiless gang not only to keep his duty but his family.