A talented, but a little too weird junior student Kim Dahyun is willing to risk it all for the love of her life, Im Nayeon that happens to be a narcissistic and popular as hell senior who doesn't even know she exists. Will something happen? Will something change?

Momo wants to become an idol but unfortunately her father won't allow her. She met two new friends and suddenly they got the chance. BUT they have to dress as boy to enter St. Mary's Academy, the school where they can start their dream. Momo's life turns out differently after she entered the school and met its student representative aka St. Mary's Academy Queen