STORYSYNC is an AI-powered interactive media facade system that automatically transforms visitors' SNS photos into real-time storytelling content, inspired by the mythology of Jeju Island—a UNESCO World Natural Heritage site in South Korea. When visitors upload images to SNS at specific locations within Jeju Folk Village, STORYSYNC instantly analyzes the content using computer vision and natural language processing to generate immersive visual media fused with traditional folklore narratives. The resulting projection-mapped display appears on large outdoor curved structures, merging personal memories with traditional local narratives to create a shared cultural storyscape. Unlike conventional user-participation content that merely displays photos, STORYSYNC transforms each visitor into part of living folklore, where personal records return as living myths. This emotional and immersive experience redefines cultural tourism for the social media era while offering a visually intuitive method to communicate regional heritage and creating participatory cultural experiences suited to modern digital natives.