In the Korean dictionary,‘wanjeon’(완전) is described as a noun, however in the internetlanguage and spoken language it is often used as an intensifier whichmeans ‘very or quite’. So far, research about ‘wanjeon’ was mainlyfocused on its syntactic and semantic characteristics. However, thereare few research that is concerned about wanjeon’s characteristics asan intensifier. Therefore, this research aims to study ‘wanjeon’ as anintensifier and how its usage transformed in parts of speech and thesemantic characteristics. Moreover, the paper will compare thedifferences of syntactic and semantic features between ‘wanjeonhi’(완전히) in internet language and spoken language. According to SejongSpoken Corpus, we can clearly observe the manifestations of wanjeonwhen it was used as an intensifier in definite sentences. Meanwhile,we can find wanjeon’s semantic prosodic characteristics when it wasused as an intensifier, and how gender-difference and hierarchyaffect the usage of wanjeon