en Cuevana 3. After divorce from her husband, Na-yeon, who lived with her son Dong-jin, suffered from a business failure. At the request of a junior democrat who has nowhere to go, four people live together for a while. Hyung-cheol tries to sex with Min-ju, but is rejected. Hyung-cheol, who is idle without knowing the date, is dissatisfied, I'm going out saying I'm looking for a job even by myself. There are only Nayeon and Hyungcheol at home. Nayeon takes a shower while Hyung-cheol is sleeping and masturbates while thinking of Hyung-cheol. Hyung-cheol woke up thinking that the moaning in the bathroom was democratic. Nayeon is surprised to see her masturbating, but she cannot overcome her excitement and attacks her. When the two sexes were in full swing, Min-ju, who came back home, sees it. That night, he goes to Dongjin's room and tells the truth...