Temporary employee Ms. Kim (Kim Hye-Soo) does everything at work. She is also shrouded in mystery. Her colleagues do not know her name or her background. Ms. Kim is the center of attention and she is also charismatic and funny. Jang Kyu-Jik (Oh Ji-Ho) is a permanent employee. He finished his MBA in the U.S., before returning to Korea. Ms. Kim and and Jang Kyu-Jik argue about everything.