The five shining boys SHINee have a mission to complete before their next comeback. Their mission is to transform a shy and quiet girl to a confident singer. They are given six months to transform her. Failure to do so, their comeback will be postponed to a later date until the girl debut. However, the SHINee members need to treat her as their yeo-dongsaeng and not as trainee. Will SHINee be able to complete their mission successful