Des:Mai is dissatisfied with her sex life with the man she is thinking of marrying. When her frustration reaches its peak, she ends up having a physical relationship with a kind man who attends her swimming class. Her one and only affair... That was her intention, but before she knew it, her body began to desire someone other than him. At the end of the lesson, a beautiful instructor with a young, toned body, slender body, and outstanding figure loses herself in the empty pool and cries repeatedly.