In the map of your website, the name of the sea between Korea and Japan is described as "Sea of Japan". It seems unreasonable to use the name "Sea of Japan" which is decided in the period of imperialism because its original name is "East Sea" which has been used throughout history. Therefore, I believe that the body of water between Korea and Japan should be described as the “East Sea” or at least with the simultaneous use of both names; “East Sea/Sea of Japan.”

Using the proper name for the body of water between the Korean peninsula and the Japanese archipelago is not simply a matter of renaming geographic features. It is part of the national effort of Koreans to erase the legacy of Japanese imperialism and correct the resulting unfairness.

https://www.dreamstime.com/stock-illustration-north-korea-political-map-capital-pyongyang-national-borders-important-cities-rivers-lakes-english-labeling-scaling-image69138964