SEOUL, South Korea  — Lee Soo-nam was 8 the last time he saw his older brother. Sixty-eight years ago this month the boy watched, bewildered, as his 18-year-old brother left their home in Seoul to escape invading North Korean soldiers who were conscripting young men just weeks after invading South Korea to start the Korean War.

An hour later his brother, Ri Jong Song, was snatched up by North Korean soldiers near a bridge across Seoul’s Han River. Lee always assumed Ri died during the three-year war that killed and injured millions before a cease-fire in 1953, but his mother prayed daily for her lost son’s return, only giving up a few years before her death in 1975.