So-yeon spends a lonely and boring day because her husband is addicted to work and fishing. One day, her junior high school friend Soji moved in next door to her. Unable to suppress her long-suppressed desire, So-yeon secretly watches the passionate scene between So-ji and her husband Sang-min. Eventually, during So-ji's business trip, So-yeon has a torrid relationship with Sang-min
That night, Su Yan witnessed Suzhi and Shangmin stepping out of the car, taking care of her tenderly. So-yeon starts to suspect an illicit relationship between them and summons Su-ji the next day. During that meeting, So-yeon heard a shocking confession.