This paper focuses on the construction of authentic rapper identities among Korean rappers throughout the history of rap in Korea. The first part of this study describes the historical development of linguistic practices and available linguistic resources that were commonly exercised and exploited by Korean rappers over time, while the latter part demonstrates how those practices and resources become components constituting and constructing various rapper identities through Eckert's (2008) framework of “indexical field.” The exploration of the Korean rappers' linguistic practices reported that Korean rappers have developed a number of creative and innovative practices throughout the history of Korean rap and hip-hop. The second part revealed that Korean rappers' innovations and creative practices have become more and more complicated over time for more sophisticated rapper identity construction and projection.