Gangseo, while having sex with his girlfriend these days, often thinks about playing her older sister. Try to blame yourself for being a pervert, but if you see the sexy look of your performance. The body reacts instinctively at all times, and finally even dreams. One day, Gangseo overheard the sound of his older brother, Chan-joon, and his performance after sex. In Chanjun's swear words, I find out that the performer is from a room salon waitress... ​.