'But the word 'sea of Japan' is not the correct word. We have to use the ¡®East sea¡¯ instead of ¡®sea of Japan¡¯
China, South Korea, North Korea, Japan : four countries are close by this sea.
So any country can¡¯t argue the owner ship.
South Korea use the word ¡®East sea¡¯ during 2000 years. And some old Japanese maps wrote the word ¡®East sea¡¯ too.