One lived for the spotlight. One died for her songs. Now, they are bound by a secret that could save her career—or shatter his soul.Kang Min-Hee was once the "Nation’s Golden Voice," until a stinging betrayal by her boyfriend and a ruthless rival left her reputation in ashes. Her music stolen and her fans turned into foes, she is a ghost in her own life, wandering the halls of her college campus in a daze of grief.But Min-Hee isn't the only ghost.Lee Do-Hyun was a brilliant, invisible scholarship student whose only joy was writing melodies for the idol he loved from afar. When he dies in a tragic accident defending her honor, his soul refuses to cross over. He remains anchored to the living world by a single object: a leather-bound notebook filled with the masterpieces he never got to give her.When Min-Hee discovers the notebook, she finds more than just hit songs. She finds Do-Hyun.Though no one else can see or hear him, Do-Hyun becomes her invisible producer, her silent protector, and the only person who truly knows her heart. As Min-Hee begins a legendary climb back to the top of the charts fueled by his "ghostwritten" melodies, the line between the living and the dead begins to blur.But every miracle has a price. Hidden in the final pages of the notebook is a truth Min-Hee isn't ready for: once the world hears his last melody, Do-Hyun will vanish forever.In the cutthroat world of K-Pop, fame is temporary—but some melodies are eternal.