Watch Online Free on Watchseries. Behind the scenes of a world-renowned K-pop star is another voice that no one knows. Hanna, who has outstanding singing ability but cannot stand on her own stage due to her appearance. She lives as a shadow singer. Then, one day, she gains beautiful appearance through the mysterious power of Necklace, and debut under the name 'Jennie' to become a top star. However, behind her spectacular success is a cruel secret trading of souls and desires.