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The story of how a line on a map becomes a hard state border that no one can cross.

Korea was ruled as one Kingdom for a thousand years. They valued poetry and scholars helped rule the country. But their Kingdom was invaded by Japan. When Japan left, Russia and America raced to take their place. Amid frantic organising, a line dividing Korea in two was suggested. Who knew that line would become the front line in a war, eventually creating a hard border between two new countries?

This is a special edition that 10-14 year olds can also enjoy, but if you are not in that age bracket we hope that there’s something in it for you too. It’s a trial and we’d love to know what you think. Email theinquiry@bbc.com or tweet @bbctheinquiry – thanks to Niko, Christina and Sophie for your feedback. The Inquiry will be back to normal next week.

(image 2018: A North Korean student attends a class at Kang Pan Sok revolutionary school outside of Pyongyang. Credit: Ed Jones/Getty Images)