This design-based study explored the digital and linguistic practices of South Korean adolescents from a rural area within the Write4Change global online community, emphasizing their use of image-driven tools. Framed within the cosmopolitan literacies perspective, these adolescents adeptly merge local and global dimensions, integrating their multilingual identities, and compelling visual narratives into their work. They navigate English, the dominant language of the online community, while incorporating multilingual elements to enrich community dialogues. These practices reflect their linguistic adaptability and digital literacies and underscore the significant role of cosmopolitan literacies in transforming literacy studies. The study highlights the impactful digital practices of South Korean adolescents, contributing to a broader understanding of inclusivity and diversity in global literacies.