Betrayal. Deception. Control. They're in your head. Your music. Your soul. Six months after exposing a government conspiracy, Ji-soo discovers "The Maestros" – a shadow network embedding mind-altering frequencies in K-pop to manipulate millions. When supergroup Eclipse mysteriously vanishes after their Bangkok performance triggers unexpected resistance, Ji-soo uncovers the horrifying truth: they're prisoners in a "wellness facility" being neurologically reprogrammed – using technology her own father helped create. As Ji-soo races to infiltrate the facility, trust within her team shatters. Min-ho's unexplained disappearances, Yuna's suspicious family connections, Hyun-woo's advanced technical knowledge – who's really pulling the strings? With The Maestros' influence reaching into every entertainment company and government office, Ji-soo has days to free Eclipse before the Harmony Festival unleashes their ultimate control mechanism on an unsuspecting global audience. The battle for free will has begun, and the music never stops – but someone else is conducting the symphony