It follows the story of middle-aged office workers struggling to survive in a turbulent workplace.

Dang Ja Young, the team manager of Human Resources, is a cold-hearted woman who is an overly diligent workaholic. She is currently racing towards her goal to get a promotion to an executive position. At this point, Ja Young is given a secret mission as Choi Ban Seok, who worked for over 22 years as an engineer, transfers to Human Resources as her subordinate. On the other hand, Han Se Kwon, the ex-husband of Ja Young, was able to get promotion way too quickly as the head of the Research and Development Team 1 with his flexibility and brilliant speech. However, he has his own challenges and weaknesses that nobody knows about. In Hanmyeong Inc., employees with different abilities and backgrounds are struggling to survive in an ever-changing workplace.—HanCinema