Multi-culturalism all over the globe has led to an increase of the bilingual and trilingual population. There has been an increasing interest in doing research on code
switching of bilingual speakers. This study focuses on the potential theoretical explanations for the language behavior of overseas Korean Chinese. There was an influx of overseas Chinese into Korea in 1882 due to the Imo incident. Following the next 100 years the Chinese formed their own ethnic group in Korea, protecting their culture and language. This study attempts to investigate their bilingual background and the phenomenon of their language evolution through questionnaires, natural discourse, and in-depth interviews. Part One covers the scope of research motivation and the purpose of the preceding studies and research methods. Part Two examines the bilingual background of Korean Chinese, their history and language development, and finally, the linguistic phenomenon and background of the questionnaires. Part Three examines their real conversational phenomena of language and divide it into two parts: the first part focuses on the similarities of Korean and Chinese conversational grammar, and the second part discusses on the differences and the dynamics between Korean and Chinese conversational grammar.
