T4G aka The 4 Gems are four best friends and they go to a school for talented kids. This school goes by the name of N. West and is one of the richest schools in the country. 

then there is BHJY the band made by the leader HeeJin who always tries to beat T4G. Her bandmates are all different and one of them is only in it to help with homework and for her amazing voice. 

one day a new group comes to the school and they go by the name Teen Top.