Boeun (Moon Geun Young) is an ordinary high school girl who worries about grades and has a crush on her school’s baseball team ace, Jungwoo. One day, Boeun’s grandfather orders her to marry Sangmin (Kim Rae Won) because of a pact he made with Sangmin’s grandfather during the Korean War. Despite the grandchildren’s opposition, they are forced to marry because of Boeun’s grandfather’s strong influence. Boeun’s undercover married life begins: She pretends that she doesn’t have a husband and starts dating Jungwoo. Boeun believes that she can manage both men and live a double life. Everything goes smoothly until Sangmin visits Boeun’s school as a student teacher… (Wikipedia)