Bar examiner Yoo-jeong likes sex more than studying. Thanks to the secretive, but erotic tutoring by the teacher her boyfriend introduced to her, Yoo-jeong’s grades shoot up. Yoo-jeong’s mom, Mi-jin, however, feels attracted to her tutor and starts seducing him.

Min-hwan, who lives with his brother, was lovers with his youngest sister-in-law. The sex continued even after she married his brother. Eun-hye, who is seeing elder men behind her boyfriend’s back, goes to Min-hwan’s house one day, and is surprised to see Min-hwan’s brother. The elder man she’s meeting in Min-hwan’s brother.