Kang Seo Jun finally has gotten a taste of freedom, and decides to celebrate his newfound freedom by going to the gym. This year, he's going to go all out: he's going to learn to cook, get ripped, work hard at his job and climb the corporate ladder, get a girlfriend and finally get laid—or so were his plans. But those change when Kim Taeyeon, his assigned personal trainer, meets him and decides she has other ideas for the young man...