The sea between the Republic of Korea and Japan is called in two ways, the East Sea and the Sea of Japan.Through negotiations, Korea and Japan agreed to use both names together.However the article in your website only used the second one.
This is a very sensitive problem in Korea.
I am not forcing you to only use the East Sea when you write an article about it. However I hope you to add the name East Sea.
The Sea of Japan is the name by Japan who are arguing that sea is their territory. But as you can see in the map, in our point, the sea is our territory as well.
Therefore, I wish you to add the East Sea even though the article was about Japan.
I would greatly appreciate you to do so.