South Korea's residence as the ancestors from a ¡°East Sea¡± and has been living there. Therefore, the East Sea is already from 37 B.C. to an established term. In the 17th century, from the 19th century, most of the country use ¡°Sea of Korea¡± or ¡°East Sea¡± or ¡°Sea of Joseon¡±. But by the late 19th century when Japan invaded and colonized Korea, they had a distinct influence in the international community from then on. Therefore, ¡°sea of Japan¡± become more common. But now, many people and Korean are work hard to use the world "East Sea" including me.