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.