19-year-old Kang Seulgi wanted nothing more than to get permission from her parents to play basketball, even if it means that she has to cut her hair, move to Seoul, and hide behind the identity of her 21-year old brother.  But never did she expect for music prodigy, Bae Joohyun, to fall in love with her.   What will happen when Joohyun finds out that the boy that she is crushing on is actually a girl?