We examine strategies for the social reproduction of elite families in the Korean modern transition period. Even though Korean society in the modern transition period experienced radical structural changes, it is generally accepted that there was no major change in the Korean ruling class after Japanese colonial era. This study revisits this issue, taking a diachronic perspective to analyze the way the Korean ruling class reproduced their class from the late Joseon Dynasty when the Korean Modern Transition Period began to the 1960s when Korean industrialization started. We conduct a case study of an elite family: that of Yun Chiho’s family, which not only produced Yun Chiho, a ‘First Korean Modernist’, but also many other leading people during the Korean modern transition period. Analyzing Yun chi-ho’s family provides an excellent opportunity for examining class reproduction strategies in a Korean elite Family. We examine social activities of Yun chi-ho’s family in various historical records, from government compilations such as Annals of the Joseon Dynasty·Diary of the Royal Secretariat·Official Gazette, to newspapers like The Dong A Ilbo, Maeil Shinbo and finally Diary of Yun Chiho which is personal records. We classify social activities of Yun chi-ho’s family into several groups such as public office, social activities, academic genealogy, economic activities, occupations and marriage lineage etc., and we will conduct the analysis of social network based on this. This study will show how Korean elites strategically established social networks for their class reproduction, with implications for contemporary Korean society.