A North Korean defected to South Korea on Thursday by crossing "neutral waters" between the two Koreas, multiple military sources said.The individual crossed the neutral zone of the Han River estuary located west of the inter-Korean land border and arrived at South Korea's Gyodong Island in the western port city of Incheon, according to the sources.Defense Minister Shin Won-sik said an investigation was under way by relevant authorities when asked about the defection during a session of the parliamentary defense committee.Source : Yonhap News Agency