Yoona is asked to join a new group SNSD for Entrain high school. Three schools will battle it out for 2 million dollars as well as the 2018 dream concert. Entrain: (SM, YG, Cube, Pledis) Emplane: (BigHit, FNC, LOEN, DSP) Embus:(Starship, JYP, Woollim, Fantagio)