What do you do, when your best friend since first grade suddenly becomes a K-Pop Idol? That is exactly what happened to Lee Yuna, when her longtime-friend Kim Taehyung becomes famous as BTS V, the most popular member in the group. After a reunion of them 5 months after he left for the "Love Yourself World Tour" Yuna starts to realize, how hard it is to keep a friendship with an idol, that is adored by so many people and that rumors are real. Beside all that, she also has a crush on Tae's band member Jeon Jungkook, who's always been super kind to her. But when Yunas dad dies, she finds herself on Taes side - not in a friendly way.