In an age where even love and marriage are reduced to calculations—where no one wants to take a loss—a refreshing kind of romance begins to bloom between a man and a woman living in the smog of modern life.

Hyun Dayoung, a 35-year-old career woman who’s followed the elite track all her life, finds herself growing anxious as marriage remains the one thing she can’t seem to control.

Choi Woojin, also 35, is an unmotivated bachelor who believes the downfall of his older sister’s marriage was simply due to the age gap between her and her husband.

Pressed for time and having long passed the so-called “right age” for marriage, these two stand at a crossroads.

Can they overcome the ten-year age difference and the weight of reality to rediscover sincerity... in the face of a bold and unexpected love?