Chan-Joo (Park Sol-Mi) and Jin-Se (Hong Jong-Hyeon) married three months after meeting for the first time. Three years later, the couple enjoy a peaceful marriage, but things change when their ex-lovers appear. Ran (Bae Noo-Ri) is the daughter of Jin-Se"s former teacher. Eun-Hyuk (Kim Min-Jun) is Chan-Joo"s ex-lover. Because of Ran and Eun-Hyuk, Jin-Se and Chan-Joo become shaken.