I uploaded Jeju island map in Japanese PDF file
download Download “Jeju map Japanese PDF file” JEJU_MAP_JAPANESE-2020.pdf – Downloaded 1964 times – 5.01 MB
This PDF file from Jeju Tourism Organization website.
You can also download from https://www.visitjeju.net/en/tourInfo/guide?tap=two&menuId=DOM_000001810005000000#