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영어

The purpose of this paper is to clarify a cause that changed the vowel system from the 15 century to the 18 century in Korean. For this purpose, a series of phonological events in Korean that occurred from the 15 century to the 18 century, that is, ‘ㅿ>i, ㅿ>a, a~?, o~u, ?~o,i~u’were analysed. As a result, it was found that 'i' is related to the change of vowel system after the 15century. However, the function of 'i' in Korean history is not well known. Therefore, priority should be given to clarifying the function of 'i' in Korean history.