Sexually lustful pizza delivery woman, Seung-ha VS customer who wants to swap, Yoon-yool. The Hye-jin couple, who advocate free sex, point to the pizza delivery man Ji-yeong and Dal-soo as partners to enjoy with them, and execute an erotic operation. When Ji-yeong arrives, Hye-jin's husband shows off his erection, and when Dal-soo arrives, he seduces her with his chest and erotic poses. During the delivery, Ji-yeong witnesses Hye-jin and Jeong-woo, a Chinese restaurant delivery man, having a love affair at the entrance of an apartment.