With the prolonged division of South and North Korea, the tendency of South Koreans, especially 20-30 generations, to recognize North Korea as a national community is fading. These generations are looking for a reason for reunification in peace on the Korean Peninsula. Unification education, which was renamed "Peace and Unification Education" in 2018, stresses that unification of the two Koreas is a contribution to world peace. But at the same time, it also emphasizes open nationalism. There is no concrete plan to provide unification education that contributes to world peace based on open nationalism in any way. This paper presents interculturalism as a way of unification education for the unification of the two Koreas, which contributes to world peace. The core of interculturalism lies in communication beyond mere recognition of other cultures. Therefore, unification education for integration with North Koreans who have different cultures from South Korea should focus on fostering (world) citizenship based on interculturalism.