Analysis of information sources in references of the Wikipedia article "Hangul" in English language version.
They later devised three different systems for writing Korean with Chinese characters: Hyangchal, Gukyeol and Idu. These systems were similar to those developed later in Japan and were probably used as models by the Japanese.
1937년 7월 중일전쟁을 도발한 일본은 한민족 말살정책을 노골적으로 드러내, 1938년 4월에는 조선어과 폐지와 조선어 금지 및 일본어 상용을 강요했다.