The more stealthily you do, the more you are drawn into… Soo-yeon lives a dull and boring life daily because her husband is always busy with work and goes fishing when he is not working. One day, Soo-ji, one of her high school friends moves to the house next door. When Soo-yeon happens to watch sneakily Soo-ji and her husband Sang-min having sex, her desire becomes so strong that she becomes to have hard time trying to suppress it. Soo-yeon ends up having passionate sex with Sang-min one day when Soo-ji is away on a business trip. That night, as Soo-ji spots Soo-yeon and her husband getting out of a car together and her husband being sweet with her, Soo-ji becomes suspicious of an appropriate relationship between the two. Next day, when Soo-ji asks Soo-yeon to meet her outside, Soo-yeon reveals a shocking story to her.

Couple Soo-ji and Sang-min, who once lived next door, and Soo-yeon who experienced having an affair, spends a moment of confusion due to Soo-ji's sudden death, and now lives a normal life with her husband Dong-seok. Then one day, Dong-seok gets into a parking dispute with Mi-ran, a newly-married couple who moved next door, and Soo-yeon is embarrassed to learn that Mi-ran is the female junior who once had lesbian tendencies towards her in college. Two couples living next door and getting close. Unlike before, Mi-ran has become a lawyer and ignores Soo-yeon. Soo-yeon gets angry. Meanwhile, Soo-yeon found out that Mi-ran's husband, Seok-ho, is a stay at home husband, and Soo-yeon who is in the same situation is attracted to him.