Min Sang Sik (Jung Joon Ho) is a department head for a large corporation. He already married, but is attracted to Chae Song Ha (Yum Jung Ah), who stay downstairs of him in the same apartment. Chae Song Ha works as a marketing team leader for an advertising company. She is a perfectionist and needs everything perfect at home and work. Although she has a husband who works as a doctor, her life isn’t filled with joy…