I will consider the important issues relating to peace psychology that Koo and Han raise in their article, South–North Korean Relations: the integrative complexity in correspondence. Their article carries out 5 significant tasks: (a) to present the theory, integrative complexity; (b) to add to our limited analysis of divided peoples; (c) to demonstrate the complexity of cross-cultural analysis; (d) to emphasise the need to integrate historical references, culture, and many other factors to our understanding of policy decisions; (e) to analyse the relationship of power, affiliation, and achievement, with integrative complexity.