This drama revolves around an uptight, do-it-himself former-boxer boss and his supportive, versatile, ever-solo secretary. Jwa Yoon Yi (Baek Jin Hee) has lived her life with a passive attitude. She has a spirit of devotion and obedience. Meanwhile, Nam Chi Won (Choi Daniel) is the director of HB Company, but he refuses interests of other people and developing relationships. The woman and man meet as secretary and boss.

允兒是個超級能幹的秘書，能同時處理多項工作，而她的老闆致源則是個拒絕他人關心的冷漠男。做事完全相反的二人相遇，在辦公室發展出一場秘書大戰老闆的惡鬥。