The drama revolves around the complex relationships between two couples. Yoon Tae-oh (played by Oh Ji-ho) and his wife, Jung Soo-yeon (played by Kim So-yeon), are a seemingly happy couple. However, their marriage is put to the test when Tae-oh falls in love with his secretary, Cha Jin-kyung (played by Kim Ha-rang). Meanwhile, Soo-yeon's past comes back to haunt her in the form of her former lover, Kim Do-haeng (played by Choi Jung-hyuk).