After 6 years of marriage, the couple, Young-min and Cheol-jun and Ha-bin, had a deep relationship with each other for the sake of their desires. Secret encounters with brother-in-law and sister-in-law, as well as a fresh and enjoyable relationship with older sister and younger brother-in-law, continue. A biting and biting S relationship between four people who enjoy a very secret date in strict secrets for their own desires!