This thesis explores the transmission and reproduction of collective memory and historical knowledge of the Korean War among South Koreans in the United States, examining how these dynamics contribute to the formation of diasporic identity. Through a case study rooted in the historical experiences of colonization, occupation, and emigration, the research situates itself within the broader framework of collective memory studies with an emphasis on intergenerational memory. With semi-structured interviews, the study investigates the processes of memory formation and transmission across three generations: the wartime generation who rely on autobiographical memory, their children whose generational consciousness is characterized by post-war reconstruction, and the grandchildren who actively engage with war memory. The findings highlight the relationships between personal, national, and transnational narratives in shaping individual and collective identities. By understanding the mechanisms of memory transmission within diasporic communities, this research contributes to broader discussions on historical narrative, cultural identity, and the impact of collective memory on social and political landscapes.