Yoo, Ji-yeon: Starring Kang, Seong-yeon

Raised as the only child in an upper middle-class family, she is full of pride. Obeying her father, she broke up with her boyfriend to marry a college lecturer, Yoon Il-hyun. Despite being a devoted wife who even used her dad's wealth to give her husband a tenured position at a university, her husband cheats on her with one of his students and moves in with her. Shocked and hurt, she vows to get revenge on her husband.

Yoon, Il-hyun: Starring Ahn, Jae-mo

Ji-yeon's husband and a professor of Korean literature at a prestigious university. Determined to climb out of poverty, he excelled at academics and put himself through college and graduate school by working part-time jobs at night. He finds an unfulfilling job as a college lecturer. He purposefully approached Yoo Ji-yeon after learning that her family was rich. Thanks to her dad's money, he was able to secure a tenured position at a university but he falls in love with a young, bright student of his and cheats on his wife.

Cho, Gyeong-soon: Starring Kim, Ji-yeong

To escape from poverty, she married Han Ki-cheol but found out that he was just as dirt-poor as her own family. But one day, the land that Ki-cheol inherited from his parents is zoned for a city development project and they happen to receive a windfall of money and become rich overnight. When her husband starts cheating on her, Gyeong-soon goes on a spending spree to enhance her looks. When she learns that her archenemy Yoo Ji-yeon also has a cheating husband, she warms up to her and they forge a new friendship.

Han, Ki-cheol: Starring Lee, Jong-won

He is Gyeong-soon's husband who has married her without a wedding because his family was too poor to afford it. One day the land he inherited from his parents became zoned for development and he happened to receive a windfall. But he is still tight with his money and gives his wife a small allowance. He falls in love with a young golf instructor who works at his indoor golf teeing course and starts to despise his ignorant and uncultured wife.

Oh, Jung-mi: Starring Hwangwoo, Seul-hye

She runs a nail and hair salon with her husband. She never liked studying since she was little and acted older than her age. So she struck out on her own when she became a teenager and made a lot of money by starting a small business. She married Lee Sung-ho, the owner of a hair salon who is four years younger, after frequenting his salon. One day, she hears a rumor that her husband is gay and believes that it is the reason why he has been avoiding having sexual relationship.

Lee, Sung-ho: Starring Hwang, Dong-joo

Jung-mi's husband. He has feminine qualities inside and out, but also has a bottomless reservoir of strength underneath the surface. He got married with Oh Jung-mi, who was a regular customer at his hair salon. He tries to convince his wife that he is straight but she won't listen. Out of exasperation and anger, he cheats on her with a working girl.