Who is the culprit? Are you a stalker?

Mi-yeon, an elite woman with a mysterious past, and her husband, Yeong-jeon, a novelist who doesn't know her secret. Mi-yeon is the head of a large corporation. She is a woman who enjoys a free-spirited sex life and is married to a novelist, Yeong-jeon. On the other hand, a married couple, Taeh-yeon and Seo-ra, moved into their neighboring house.