Contract employee Ms. Kim (Kim Hye Soo) does everything perfect at work that even her bosses are a little afraid of. She is also shrouded in mystery because her colleagues donâ€™t know her background. Ms. Kim is the center of attention and she is also charismatic and funny. Meanwhile, Jang Kyu Jik (Oh Ji Ho) is a permanent employee in upper management. He finished his MBA in U.S. before returning to Korea. Two of them always argue about everything.