Hello Jiyeon Ha!

Thank you for bring the name issue to our attention!

As explained on our website, geographical maps were made ~ 20 years ago with the data on our disposal at the time. Maps are afterwards only occasionally updated.

With that said, your request to rename or add the additional name of the sea is added to our ToDo list.  The name issues that exists in between those countries will be looked at closely. Any international resolutions and common name uses will be taken into consideration as well.

Thank you and have a great day!

K. @ Baburek.co