More and more students are playing online games, and many of them become addicted gamers. However, most teachers are unfamiliar with online games, and they hence have no chance to participate in students' gaming experiences. The purposes of this study is to explore whether teachers with and without online-gaming experiences perceive online games and teacher-student interaction differently. The results confirm the existence of teachers' perception differences regarding online games, the influences of students' online-gaming experiences on learning, and teacher-student relationships. Finally, recommendations for teachers and researchers are provided.