Song Mi-Young is an aspiring dancer. Because of her bias, Jung Hoseok from BTS, she dreams to one day dance on stage with Hoseok. One fateful day, she heard that Bighit Entertainment was holding auditions for trainees, but there was a tiny issue. Bighit's requirement is that you must be a boy to audition. Desperate to make her dream come true, she disguises herself as a boy name Song Youngjae and passes the auditions. What is going to happen to Mi-Young on her journey as Youngjae?