This study explores how generative AI enhances the international communication and educational value of classical literature through cross-media narrative design, using Dream of the Red Chamber as a case study. It proposes an interactive storytelling system integrating text, visuals, and user interaction. The design employs large language models and diffusion models to create a seamless fusion of text, imagery, and interactivity. Key components include an AI-driven dialogue system, dynamic scene visualization, and an interactive operation zone. Users engage with characters via natural language input, while Stable Diffusion generates scene imagery, rendered in Unity 3D for an immersive environment rooted in traditional aesthetics. Designed primarily in English, the platform enhances cross-cultural communication by lowering cognitive barriers to classical literature. This study highlights AIGC-driven cross-media narratives as a pathway for global appreciation of cultural heritage through digital innovation.