The present study aims to investigate cultural similarities and differences that influence interracial couples (between Korean men and Vietnamese women) when adapting to Korean family culture in terms of interculturalism. The interviewees consisted of three generations. This study used in-depth interviews. Data was collected from January to August 2008. 15 families (45 people) were used for analysis. Results were as follows: (1) the patriarchal culture of the two nations had a positive influence on the adaptation of members during family interactions(2) the culture of filial piety is a value system that both nations believe is important. However, different rituals had a negative influence on the practice of filial piety (3) the community-oriented culture is regarded as important in the two nations. However, Vietnamese wives cannot lead a free community life because Koreans see them in negative terms (4) the Vietnamese traditional wedding custom called "NopJjeOh" had a negative influence on the adaptation to the Korean family culture (5) the preference for sons in Vietnam is not as high as in Korea. This difference had a negative influence on adaptation (6) clear differences between the daily lives of the two nations had a negative influence on adaptation to Korean family culture. In conclusion, Korea and Vietnam have many similarities in culture, which enable Vietnamese wives to adapt to Korean culture more easily than other foreign wives. If various programs are developed to promote the mutual understanding between both cultures based on these research findings, it would further contribute toward social integration in Korea.