A new girl group called STAR will debut under Big Hit Entertainment. With BTS as their seniors, the standards are set high for the new 4-member hip-hop girl group. As they gain popularity, their paths cross BTS's multiple times throughout their career. It doesn't help the fact that both STAR and BTS's managers are close, which causes inevitable encounters between the groups. Will the blossoming relationship between the idols cause trouble in the future, and possibly destroy STAR's chances of becoming famous, or will there be no relationship at all?