Jang Hyeok (Jang Ki-Yong) is in a romantic relationship with Jung Da-Eun (Chae Soo-Bin), who works as a nurse. When they first started to date, Jang Hyeok was a sweet boyfriend to Jung Da-Eun, but he is not anymore. Meanwhile, Jang Hyeok begins to work as a temporary worker for a large company. He tries to get a permanent position at the company. This places Jang Hyeok in a competitive position with Han Bo-Yeong (Krystal), who also wants the same job. Jang Hyeok and Han Bo-Yeong also cooperate with each other and, as they work together, they get closer.