“I’m the only perfect match for myself. Singlehood is the answer!” Walking alone, resting alone, eating alone, living alone… ‘Young-ho’ (Lee Dong-wook) is a power influencer who enjoys being alone. “No one is completely alone.” Having a fling alone, thinking it’s a ‘green light’ to start dating alone… ‘Hyun-jin’ (Lim Soo-jung) is an expert editor of a publishing company who hates being alone. Young-ho and Hyun-jin meet as a writer and editor of an essay series about being single called, "Single in the City". With very different lifestyles and values, they butt heads over the book, but slowly start to feel that it’s not so bad being together. In Seoul, where it’s comfortable alone but love is in the air, the single lives of “Young-ho” and “Hyun-jin” are unveiled!