Set during the reign of famous tyrant King Yeonsangun (Kim Ji Suk), it tells the story of Hong Gil Dong (Yoon Kyun Sang), who stole from the rich and gave to the poor. Hong Gil Dong is the second son of a servant, Ah Mo Gae, and he is known as the Mighty Child and has incredible power. This drama embarks his journey in becoming Joseon's first revolutionary activist.
(Source: DramaWiki)