Why BTS ?

A girl named Marissa Dunn from Los Angles dislikes K-POP music for no reason, one day she meets a Bang-tan boy group named BTS and doesn't know who they are, so her friend Yen Cheng tells her more about them to try to persuade her to listen to K-POP. Soon through running crowds, girls screaming, and chanting BTS. She not only learns to like BTS but also all of K-POP.