A lively, somewhat inebriated evening with her brother’s two closest friends, Jiwon and Eunho, leads to a surprising threesome for Yeonhee... and then it unexpectedly occurs again. Who will she select? Jiwon or Eunho? Which one will triumph in winning Yeonhee's affection... and more? To complicate matters, she must keep all of this hidden from her older brother, Yeolchan. Can they manage to keep it under wraps? Or will a single mistake cause everything to unravel?