In the attached website below, your company mantions the sea as part of Japan. However, it is clear that the ocean territory belongs to Korea.

I urge you to use 'East Sea' to describe the body of water in question or to use both Korean and Japanese designation simultaneously (e.g. 'East Sea/Sea of Japan') in your contents and maps. 

Therefore, please check all the information related to the dispute over this sea and correct the title you put for the area.