This study is to examine the structural relationships among tourism impact, benefit, and support based on the pre- and post-survey of local residents for the Yeosu Expo. To this end, an onsite survey was conducted to residents living in Yeosu. The results of this study reveal that the positive economic impact, positive socio-cultural impact, and negative economic impact had an effect on benefit. And positive environmental impact and benefit appeared to be related to support. Also, benefit was found to be a mediating variable(full mediating effect) to connect between tourism impact(positive and negative economic impact, positive socio-cultural impact) and support. After comparing path coefficients relationships between pre- and post-survey, significantly different relationships were found(i.e., positive economic impact→benefit, negative economic impact→benefit, and positive economic impact→support). Based on these findings, theoretical and practical implications were further provided in the conclusion section.