Ko’s much older husband has erectile dysfunction, so their sex life never goes beyond caressing. She initially accepts it as better than having no intimacy at all, but her craving for stronger pleasure grows by the day. Sensing her frustration, her husband tells her he will overlook an affair. Though confused, she decides to try it just once with a man from an adultery site—and after they have sex, all the desire she has suppressed comes flooding out and will not stop.