In the limelight of K-pop, every smile, gesture, and word is part of a meticulously crafted script. Park Hyejin, the spirited leader of the sensational girl group ECHO, knows this all too well. But when an unexpected scandal threatens to derail her band's soaring popularity, she finds herself cast in a new role-playing the girlfriend of Stray Kids' Lee Know. Will the act become a little bit too real?