Idol School is a South Korean reality television program that aired in 2017. The show aimed to train and select members for a new girl group through various challenges and performances. Contestants, known as trainees, were evaluated by judges and received feedback to improve their skills. The series featured a competitive format where viewers could vote for their favorite contestants. The final lineup was determined based on these votes, leading to the formation of the girl group Fromis_9. The show highlighted the rigorous training and dedication required to succeed in the K-pop industry.