The document summarizes the division and relationship between North and South Korea over time. It discusses how Korea was divided after World War II with the Soviet Union occupying the north and the US occupying the south. This led to the emergence of two antagonistic states with opposing political and economic systems. It also outlines the major events in their relationship, including the Korean War, Sunshine Policy of engagement, recent peace efforts including inter-Korean summits and cooperation around the 2018 Winter Olympics.