This paper outlines a case study of four Vietnamese students who have just completed their exchange semester at RMIT University, Melbourne. Results indicate that the students appreciate multiple benefits brought by this experience, including a developing sense of language use, responsibility, dependence, self-awareness, integration, and problem-solving skills. But to them, the journey to Melbourne has especially opened their mind to the issues of cultural diversity and sensitivity, which they have never imagined before coming to Australia. The term "culture shock" might be best suited for them in the early days. What experiences have they gone through? What are the pros and cons of being an exchange student? How have they overcome their problems? How might these challenges contribute to their future plan? How do they conceptualize the term "global citizen"? What is their advice for those who want to go on an exchange program? Adopting an exploratory case study approach, this study will give a comprehensive picture on the experiences of these four Vietnamese students.