This article investigates new aspects of the diplomatic relations between theRepublic of Korea and the Republic of Vietnam from 1955 to 1957, through the analysis ofChoi Duk Shin’s diplomatic reports. Through a comprehensive analysis of primary sources,including archival documents from both Korea and the U.S., the study reexamines theserelations beyond the established focus on military cooperation. It investigates how anticommunism, Japan's economic and political influence, and the overseas Chinese communityshaped bilateral dynamics. Content analysis of Choi Duk Shin’s diplomatic reports providesvaluable insights into South Korea's diplomatic strategies during the Cold War. Additionally,an interdisciplinary approach examines non-military factors, including Japan’s influence andthe overseas Chinese community, providing a deeper look into often-overlooked underlyinginfluences. By highlighting these factors, the paper contributes new insights into how theRepublic of Korea's foreign policy toward Vietnam evolved within a broader regionallandscape, challenging previous studies with a nuanced understanding of non-militaryelements influencing the relationship.This article investigates new aspects of the diplomatic relations between theRepublic of Korea and the Republic of Vietnam from 1955 to 1957, through the analysis ofChoi Duk Shin’s diplomatic reports. Through a comprehensive analysis of primary sources,including archival documents from both Korea and the U.S., the study reexamines theserelations beyond the established focus on military cooperation. It investigates how anticommunism, Japan's economic and political influence, and the overseas Chinese communityshaped bilateral dynamics. Content analysis of Choi Duk Shin’s diplomatic reports providesvaluable insights into South Korea's diplomatic strategies during the Cold War. Additionally,an interdisciplinary approach examines non-military factors, including Japan’s influence andthe overseas Chinese community, providing a deeper look into often-overlooked underlyinginfluences. By highlighting these factors, the paper contributes new insights into how theRepublic of Korea's foreign policy toward Vietnam evolved within a broader regionallandscape, challenging previous studies with a nuanced understanding of non-militaryelements influencing the relationship.