This study aims to demonstrate Erickson’s theory that is an adolescent period form their identities and how Korean-Americans who study the Korean language form their identities. Also, to find a correlation between Korean language learning and identity formed. It assume that the identity perception would differ by degree of interest in Korean-Culture and learning backgrounds, and Korean language proficiency. First, contains definitions of the terminology such as Ex-patriate Koreans, Korean-Americans, identity and Korean language proficiency. The chapter then identifies the causes and the differences of identity perception among Korean-Americans. Additionally, the effect of Korean language proficiency on identity formation is examined. Finally, it is asserted that effective identity education is necessary in the Korean language education of Korean-Americans. (Yonsei University Graduate School)