Saddius, a Roman warrior, invades China seeking revenge against the Chinese king for theft. He breaks into the palace and encounters the king's daughter, Princess Su Yung. Rather than harm her, he is stunned by her beauty. Su Yung arranges a secret meeting with Saddius where they fall in love. However, their affair is discovered by the king's guard Shanghai. Upon learning of the betrayal, the enraged king forbids Su Yung from seeing Saddius again. Defying her father, Su Yung meets Saddius one last time, but he is later murdered by the king. Grief-stricken over the deaths of her lover and the conflict with her father,