"세븐 킹덤" refers to the historical period in ancient Korea when the Korean Peninsula was divided into seven distinct kingdoms. These kingdoms included 고구려, 백제, 신라, 가야, 발해, 신라, and 후고구려. Each kingdom had its own unique culture, governance, and military systems, contributing to the rich history of Korea. The era of the 세븐 킹덤 lasted from around the 1st century BCE to the 7th century CE. This period was marked by frequent conflicts, alliances, and cultural exchanges among the kingdoms. The interactions among these states laid the foundation for the eventual unification of Korea under the 신라 kingdom.