This paper reviews adjunctive characteristics of Pre-nouns in Korean. The contents discussed are as follows. First, previous studies on the Adjuncts and Specifier in NP. Second, adjunctive characteristics of Pre-nouns. Third, adjunction structure and levels of Pre-nouns in NP. In this paper, we will see the following three facts. First, demonstrative Pre-nouns is Adjunct. Second, Korean Pre-nouns are component of 'Structure island'. Therefore adjunctive characteristics of Pre-nouns shall be apply. Third, adjunction principle of Pre-nouns as a adjunct is proposed. In addition, the noun phrase structure is proposed.