Kim Min-jun, a 30-year-old office worker, feels stuck in the monotony of his 9-to-5 job and senses something is missing in his life. As he gets older, he feels pressure to achieve more, but everything feels stagnant. His life takes a turn when his ex-boyfriend, Jin-hwan, reappears after 10 years as a new colleague. While Jin-hwan remains attractive and confident, Min-jun feels he hasn't moved forward since their breakup. Min-jun tries to focus on work, but Jin-hwan seems to have different plans.