Yongsan International School of Seoul | 2,152 followers on LinkedIn. Yongsan International School of Seoul (YISS) is a private, accredited, K-12 school in the heart of Seoul, offering an American curriculum to the international community. We welcome families and students of all religions and worldviews from more than 50 countries, providing a rich multicultural experience anchored in the values of truth, excellence, and diversity. Within this nurturing environment, a commitment to individual student success is fostered by a team of highly qualified, passionate Christian educators and staff who inspire a love of learning and unleash each student’s potential to achieve.