Drama series follows two 40'ish married couples who live directly above and below each other in the same apartment building.
Department Head Min (Jung Joon-Ho) works for a large corporation. He is married, but is attracted to Chae Song-Ha (Yum Jung-Ah), who lives downstairs from him. Chae Song-Ha works as a marketing team leader at an advertising company. She is a perfectionist and wants things perfect at home and work. Although she has a husband who works as a doctor, her life isn't filled with joy.