A psychopath’s ruthless serial murders have left the entire nation gripped with fear and chaos. A honest and justice-seeking rookie police officer and a veteran detective with tragic past, face against the killer. After the encounter with the psychopath, their lives totally change.

Do Min-Ik works as a director of the mobile media 1 team at T&T. He is smart and excellent at his job. His secretary is Jung Gal-Hee. Do Min-Ik often does childish things like calling Jung Gal-Hee continually. Jung Gal-Hee carries out Do Min-Ik's orders without complaints. She looks soft, but she hides her tough side.

The satirical comedy takes place in a four-story apartment building in the suburbs of Seoul inhabited by a number of professionals: doctors, judges, prosecutors, professors, and their wives. The wives are from prestigious and highly educated backgrounds, and part of the plot will feature their efforts to get their children admitted into universities. Some grew up in families with multiple generations of doctors or lawyers, and their ambitions will be depicted with realism and comedy.