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 just suddenly happen one day.

Until it did.

After having a literal run in with Siyeol in the hallway, Aejoon is shocked to learn his school has become the filiming location for a brand-new drama starring Choi Siyeol. But that's just the beginning of bliss for this fanboy! As if meeting his idol wasn't enough of a treat, Siyeol takes special interest in Aejoon and asks him to join the show. There's no way Aejoon could say no--not to Siyeol! But now Aejoon must put his acting skills to the test by keeping his fandom a secret. After all, if Siyeol found out just how obsessed he was, he would be disgusted--right?! Except, the more time he spends with Siyeol, the harder it becomes to keep up the act. Will his devotion be met with revulsion or is the handsome Siyeol hiding a secret of his own?