Deep in eastern Jeju, a 600-year-old fortress wall still stands — surrounding a schoolyard. Susan Jinseong, built in 1439 to defend against coastal raiders, survived because a village school made it home. A fortress that found a second life.

Deep in eastern Jeju, a 600-year-old fortress wall still stands — surrounding a schoolyard. Susan Jinseong, built in 1439 to defend against coastal raiders, survived because a village school made it home. A fortress that found a second life.

Deep in eastern Jeju, a 600-year-old fortress wall still stands — surrounding a schoolyard. Susan Jinseong, built in 1439 to defend against coastal raiders, survived because a village school made it home. A fortress that found a second life.