Based in Shinmiyangyo, or the U.S. expedition to Korea from the late 19th century,'' Mr. Sunshine tells the story of a Korean boy born in to a family group of a home fighter running-away to board an American warship, after to go back to his homeland being a U.S. marine officer. He falls in love with the daughter of an aristocrat and finds the plot to overthrow the state that he once ran off from.