When her husband Seok-ho secretly expresses the dullness of her ordinary couple life to his wife, Myeong-seon makes a new proposal to her husband. Myeong-seon uses his friend Aeran as an excuse to work with Seok-ho and connects them. Seok-ho falls in a deep relationship with his wife's friend Aeran. In fact, Aeran maintains a good relationship with Byeong-suk whom he met, but suddenly the two's physical relationship begins to fade, and he finds himself weakened by a desire for more powerful pleasures and perverted desires.