Originally from the Gyeomsabok (a department handling palace affairs), he is a man with outstanding martial arts skills and unparalleled loyalty.

After fighting alongside Prince Jin Han during the upheaval, he becomes Lee In's bodyguard. Following Lee In's ascension to the throne, he assumes the role of a chief in a special military unit responsible for the protection of the king and investigating whether there is any corruption or wrongdoing. Although highly skilled in martial arts, he is wise enough to always step back before taking action, waiting for Lee In's orders. He is vigilant, understanding not only the events of King Lee In's past but also the flow of his inner thoughts. Therefore, he remains cautious of Kang Mong Woo.

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