This paper introduces a novel framework for human–AI collaborative storytelling using split-screen narrative techniques. Moving beyond conventional AI applications in visual reproduction, we develop a co-creative workflow that integrates computational capabilities with Chinese aesthetic principles to address challenges in temporal and spatial narrative design. Through a case study of The Legend of the White Snake, we demonstrate how AI enhances the symbolic representation of duality, while human expertise ensures cultural authenticity. Key findings include: (1) AI improves efficiency in generating parallel visual sequences and maintaining stylistic consistency; (2) human intervention is essential for contextualizing cultural symbols and emotional resonance; (3) the hybrid approach enables innovative visual storytelling that both respects tradition and expands creative possibilities. This research contributes to culturally-grounded AI applications in digital heritage and narrative innovation.