Shen Qingci's grandfather was once a performer. He vanished while staging his swan-song opera, Farewell My Concubine, leaving behind only the family’s inherited script. She joined the Forbidden Troupe at first to search for him, but soon discovered that his disappearance was tied to the troupe's central secret: its creator was a celebrated ancient performer falsely branded a “demon of the opera.” Their aim was to make the world remember a tragedy that had been covered up.