Background/Objectives: The continual increase off international students globally calls for the necessity for their well-being to be investigated. The existence of cultural differences if not well managed might lead to international students to be victims of social exclusion. Therefore, it is of absolute necessity that educators, researchers, school administrators, and all stakeholders of public administration seek for ways to improve on the wellbeing of international students. The current study aimed at investigating how social inclusion, resilience, and social justice can be used to improve levels of happiness for international students in South Korea. Methods/Statistical analysis: By use of a status cross-sectional quantitative research design, data for 274 international students in South Korea were collected by use of self-reporting questionnaires using online and paper survey was analyzed using SPSS PROCESS macro. Findings: Findings showed that social inclusion, happiness, resilience, and social justice constructs were significantly positively correlated to each other. Further results revealed that resilience partially mediated in the relationship between social inclusion and happiness, and that social justice moderated this mediating effect. Improvements/Applications: These findings contribute to the literature on ways to improve international students' well-being, and suggest the use of social inclusion, resilience and social justice as critically vital constructs that help to improve international students' happiness.