On the "Lost Sandbank" forgotten by the world, Lin Zhou, as the last generation of watchmen in his family, has guarded for generations a mysterious "Echoing Stone" that can calm the "Nightmare of the World". His life was as regular and lonely as an island lighthouse, until one day, Ai Lan, a mysterious female scholar from the "Federation" accidentally broke in. She brought outside knowledge and doubts about the truth of the "Echoing Stone", shaking Lin Zhou's belief that he had adhered to for thousands of years. When the ancient secrets under the sandbank begin to awaken, Lin Zhou must make a choice between the responsibility of inheritance and the truth of exploration, and this choice will determine the fate of the entire world.
