The research targeted 108 male and female students in the Korean language course of the education institutes and graduate school courses of the universities in the capital area of South Korea. The data analysis included frequency analysis, descriptive statistics, t-test, correlation analysis, hierarchical regression analysis using the SPSS program. According to the research, First, This research showed a higher adaptation of the international students from Mongolia with close Korean friends to

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... he Korean culture. Second, The international students from Mongolia had higher adaptation to the Korean culture was indicated when the students from Mongolia had close Korean friends and lower stress of cultural adaptation. Third, The international students from Mongolia had higher adaptation to the Korean culture as the stress of cultural adaptation is lower when they had close Korean friends, and the moderating effect from the social support in the relationship between the stress of cultural adaptation and adaptation to the Korean culture had statistically significant impacts.