A study of the misuse occurred by the Korean learner of Japanese. Korean and Japanese features have many similarities between Korean and Japanese. Written expressions of Korean language and Chinese characters in Japanese. Fallible Misuse of postpositions. Korean is an absolute language and Japanese is a relative language. In this paper, the Korean language learners learned how to study the pronunciation of Japanese language, Chinese characters, and grammar. The distinguishing problems of Voiced sound and voiceless sound.