High school teacher Na Aejoon has a secret obsession.He’s a total simp for the handsome Choi Siyeol from the popular idol group, A-One!Na Aejoon is so enamored with Siyeol that even his weekends are devoted to fanboying over - and dreaming about - the pop star.While he’d give anything to meet Siyeol even once in his lifetime, he’s accepted the fact that it’s not going to happen one day.Until it does. Cast in a variety show, Siyeol is slated to be at Aejoon’s school for filming. And what’s better than seeing his idol every day? Catching his attention! Suddenly cast as Siyeol’s co-star, Aejoon must put on the ultimate act: not showing his rabid fan side, lest he creep Siyeol out.But as the two grow closer, keeping secrets will become more of a challenge - for both of them.