In the study of language, the units bigger than sentences and the use of language have drawn more and more interest, and as a result of building up a spoken corpus, researches on discourse and pragmatics became active, among which the discourse marker research has become an important area. In the early days of discourse marker research, there were discussions on terms, concepts, characteristics, and types of discourse markers. In recent years, there has been a tendency to concentrate on studying the semantic function of individual vocabulary and expressions, and studies are being actively conducted in the field of Korean language education in order to introduce them in the curriculum. Especially, in the field of Korean language education, the range of the concept and type of discourse markers is used much extensively and it is needed to have discussions on this. In the researches on the semantic function of the discourse markers, there have been studies on explaining the process of semantic change and the analysis of the functions in the discourse. However, there still remain unresolved tasks such as listing the functions of discourse markers by the researchers and describing the semantics in dictionaries. In addition, it is suggested that grammatical description including research results on the discourse markers and the buildup of the spoken corpus provided together with the voice data are needed in future studies.