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In this study I aimed at finding out whether Korean consonant /ng/ is phonetically realized at onset. To do this I identified the phonetic charac- teristics of the sound /ng/ when it is pronounced at onset. When it is at onset, it is pronounced by consonance in nose made by the air in the rear part of the oral cavity. Compared with the other two nasal sounds /m/ and /n/, its phonetic characteristics are less distinctive due to a poor air passing through the oral cavity. This is why we are unable to notice whether the sound realized at onset. Therefore, it is required to articulate the sound forcefully when it is at onset. In Kyeongsang dialect the preceding syllable must be in high pitch when the sound /ng/ is pronounced by which the coda /ng/ can be properly realized. As a result, the sound /ng/ disappeared at the end of the fifteenth century although it prevailed in the first half of the century and we are unable to sense the sound when nasalized in Kyeongsang dialect.