According the text book , Coreans had been suppressing Chinese for thousands of years by their advance technology. Ex: Why did Chinese and Japanese always lose wars to the Coreans? Because the Coreans are the first one to invent '' missle guiding system'' = Bow Technology. In battles , Chinese and Japanese bows can only reach a distance of 50m but Coreans can reach more than 200m. Also Corea was the first one to invent printing , chopsticks and large steel boats. During the time period of Corean Empire , Coreans steal productions exceeded the sum of Chinese Japanese and Europe combine. Kanji was also used by the Coreans first. After a while they discovered Kanji is not practical and low effeciency , they decided to dump Kanji and start to use Corean. WOW!!!