Exchange classmates

Hye Won, Hee Jung, and Joo Hee are college classmates. Although Hye Won, who got married first, is envied by everyone, Hye Won, who has no sex life, is even more envious of her unmarried friends. Huiyuan and Zhu Xi began to discuss trying to change lovers with their husbands, so Zhu Xi, who seduced Hui Yuan's husband, and Hui Yuan, who seduced Zhu Xi's lover, began their journey of desire...