A businesswoman who is in her thirties, Yu-Gyeong Seo. She’s in a relationship that seems to be sinking every second. One day, her younger brother’s friend, I-Jun Gwon, abruptly comes into her life physically and mentally, starting an odd cohabitation. I-Jun Gwon, although he is the perfect house husband material, good at all kinds of house chores, he seems to dislike treating Yu-Gyeong as a senior. Why does he care for her so much? Why does he not like to treat her as Nuna? Well, maybe this cohabitation is rather impure. (Source: WEBTOON, edited)