This drama is about a real person by the name of "Kim Joon" in the history books (i.e. Goryeosa), a slave (aka "No-Bi" in Korean) earning himself freedom via hard work and determination, rising to the top military official serving the emperor Gojong of Goryeo
and overruling the feudalist government that had been in power for over
60 years. Major event that took place during his time was Mongol invasions of Korea.
Synopsis
A woman left her newborn child at the doorsteps of a rich merchant,
stating that the child was of the merchant's blood. Eighteen years
later, the small child grew up to be Park Jae Young (Jang Hyuk), the
younger son of PHC. He was a warm-hearted person though a bit naive in
the ways of the world and was often being used by his scheming elder
brother Park Si Young (Han Jae Suk)who was a person totally lacking in
morals. PSY lived to satisfy his own ambition and not concerned whom he
hurt along the way. Not knowing Yoon Yeo Jin (Lee Yo Won) was of the
aristocratic class, PJY had loved her since they were small children.
YYJ also loved him and tried to ignore her higher class status. When PJY
ran away from home after finding out that his father and elder brother
killed the family of a govt official for refusing his bribe and tricked
his friends into admitting the crime, he encountered Choi Dong Hee (Son
Yeh Jin) and her merchant father. Through these people, he also got to
meet the mother he had never seen who by this time has become a powerful
political lobbyist. Into the mix, the fight over who would be the next
emporer was getting intense with the 2 brothers supporting different
sides. Will good trimph over evil? More details at Drama Wiki