Old World.

'혼일강리역대국도지도', 'Map of Integrated Lands and Regions of Historical Countries'- 

Back in 1402, they didn't have the word for 'world', so that's how they named the map.

China, being the most influential kingdom to the Korean Peninsula, was drawn in the centre and took up the most space of the map.  However, Japan, being the least developed nation at the time, was drawn simply as a small cluster of islands. Interestingly enough, European, Middle Eastern and African countries were also shown on the top left corner of the map according to the size of their importance.