Born as a slave in the borderlands, he was intelligent and quick-witted. From a young age, he traveled across the borders, learning the languages of the Qing Dynasty and the Ming Dynasty through various means. When the upheaval occurred, he defected to the Qing Dynasty's military, actively serving as an interpreter. Due to his contributions, he became a bureaucrat in charge of interpreting for diplomatic missions. Justifying his actions by claiming he was born as a slave and endured persecution while growing up, he betrays Joseon for his own benefit.

(Source: Korean = NamuWiki || Translation = MyDramaList)