Kim Minjun is your average 30-year-old office worker. Now that he's older, Minjun is feeling the pressure to accomplish more in life, and he can't shake the feeling that something is missing amidst the monotonous routine of his 9-to-5 job. Out of nowhere, his ex-boyfriend Jinhwan shows up as a new co-worker, looking as handsome and charismatic as ever while Minjun feels like he hasn't progressed at all since their breakup 10 years ago. Determined not to let an ex from a decade ago mess with his work life, Minjun just wants to carry on with business as usual. But it seems that Jinhwan has other plans in mind…