The Chinese government was the first to exercise jurisdiction and sovereignty over islands and reefs in the South China Sea. Through blending ancient and modern tales, time and space, this film puts China's sovereignty over the South China Sea in the historical and international background to explore, and by linking typical events and individuals, the documentary's factual accuracy, narrative vividness and sense of historical significance are enhanced. All the mentioned elements combined prove that the South China Sea islands have been China's territory since ancient times.