This study investigates how resident support for the development of the demilitarized zone (DMZ) Peace Park incorporates two key components (support and patriotism) as part of the theory of planned behavior (TPB). The results of this study confirm that support is important because it is directly associated with three TPB constructs, and it acts as a mediator between patriotism and the three TPB constructs. Both support and patriotism are statistically significant but different depending on the distance to the DMZ Peace Park. Resident support in the predevelopment stage can possibly extend to behavioral support in the post-development stage.