Every day, a hot Min-cheol-nahee couple. Na-hee goes home to introduce Min-cheol to her sister Eun-young. After a brief greeting, they immediately go into the room and have hot sex. Eun-young accidentally saw her. From that night, Min-cheol keeps thinking and masturbating. One day, Na-hee leaves the house to meet a friend, and Min-cheol comes to the house. We are going to drink together, and Min-cheol wants to soothe her for being lonely without a lover.