Choi Jin-sung, a teacher, teaches Lyoo Chan-hee, 10, and Kim Si-hu, 9, during class on the first day of the new semester at their school on Nokdo island in Boryeong, South Korea, March 2, 2021. "It would be great if I have more friends here because I can have more options to play," said Chan-hee. REUTERS/Kim Hong-Ji SEARCH "NOKDO AGEING " FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES