Unlike his expectations, Hyeong-min is always miserable because of his wife who who doesn't care about him. To recover a sex life with his wife, Hyeong-min tries every night but he's always coldly rejected and this is making him depressed. One day, he goes out for some air and meets Hye-jin. When their partners aren't at home, they spend time together at each others' house. However, soon, they get caught and they come to a decision after a long talk....