“The culprit who is posing as a royal official is not stealing wealth. He is stealing the hearts and minds of your people, Your Majesty.” There was a divisive figure in the Joseon Dynasty who was a hero to the people but an enemy to the establishment. His name was Hong Gil Dong. King Yeonsangun had royal lineage but was reviled by his people, while Hong Gil Dong was born as a slave but succeeded in winning over the hearts of the commoners. The struggle between these two men demonstrates the qualities that a true leader needs. This TV series portrays the life of Hong Gil Dong, who survived in a hostile and tyrannical kingdom as he waged a fight against the powerful elites.