Based in Shinmiyangyo, or the U.S. expedition to Korea in the late 19th century, Mr. Sunshine tells the story of a Korean boy born into a family of a house servant running away to board an American warship, later to return to his homeland as a U.S. marine officer. He ironically falls in love with an aristocrat's daughter and discovers the dark scheme to colonize the country that he once ran away from.
A period drama that depicts the ambitions and success stories of six people with Lee Bang-won as the central figure. Lee Bang-won was the third king in the Joseon Dynasty. He helped his father King Taejo establish the Joseon Dynasty.
Jang Geu Rae played the board game "baduk" (a strategy game somewhat like chess) since he was a child. Playing the game was everything to him, but he failed to become a professional baduk player. Now he is thrown out into the real world. By an acquaintance's recommendation, He is able to begin to work at Wonin International as an intern and struggles to adapt working at a company.
Meanwhile, Ahn Young Yi is a competent and intelligent new intern and Jang Baek Ki is another co-worker. Oh Sang Sik will play their boss.