More crappy Korean map analysis by some writer named Choi Yearn-hong can be found in an August 5, Korean Times article HERE.
Apparently, the guy thinks the 1770 map of Korea pictured on the left makes everything "clear at last."
Really? An map that shows Usando (于山島 - 우산도) as the largest island in the Sea of Japan makes it "clear at last"?
See HERE for a larger version of the map from an 1882 text.