Swapping Womens Fitness Trainer (2021)

Jong-beom happens to be Eun-sook’s personal health trainer and sex partner while working as a courier. Jong-beom introduces her wife Na-jeong as Won-gil’s personal health trainer, and Won-gil receives sexual stimulation through Na-jeong. The couple, who have been sleeping for a while, are boiling over and plan to have sex with each other by switching partners.