This is your tradition.
朝鲜国王宣祖说:"中国父母也,我国与日本同是外国也,如子也。以言其父母之于子,则我国孝子也,日本贼子也。"(《宣祖实录》卷37)
Korean King wrote:' China is the father of Korea and Japan. Korea is a dutiful son and Japan unfilial one.
Here is about this king of Korea: Seonjo of Joseon - Wikipedia, the free encyclopedia
Hey, "korean"! Can you read your history? Do you know your history?