A girl, who often wears boy clothing and has the ability to act like a guy was discovered by an entertainment agent and was mistaken to be a male was assigned to train together with SJ. But here's the thing. If one member knew about her real gender, she'll say goodbye to the agency and to her dream of training with her favorite kpop band. And what's worse it, THE AGENT JUST KNEW ABOUT HER GENDER, WHEN SHE WAS ALREADY LIVING THERE AND ABOUT TO DEBUT. What will her future be?