There's long history between Korean and Japan you probably know. The part which is written as Sea of Japan is actually "East Sea" or "Dokdo"For a long time, people are all around the world was informed here as "East Sea", even Japaneses refused to accept this fact. A few of conservative Japanese suggested that this sea is theirs, and saying East sea is Sea of Japan with non-reasonable
background knowledge. This territory is Korea's.
International Hydrogrphic Organization(IHO) decides to use "East Sea" for this area. It means "East Sea" is the international standard name.
You probably are confused because people can insist something with their own historic background. However, so many people around all of the world visited your website, but they got the wrong information from it, your reputation can be lost.
With official international standards, you must change the map with corrct information.
Your website is full of information which many people are interested.
In here, I really insist you to use correct information as the reputation you have.