There was a family who lived in seclusion for generations in a world surrounded by high walls and fences. Isolated from the rest of the world, no matter how the times of the outside world change and how civilization advances, they still adhere to the ancient way of life, simple, elegant and innocent. Sometimes, the abundant sun will pass through the dense guarded forest, shining unreservedly on every old tree and every inch of thick soil, as well as on the young people who play like two elves and disappear and suddenly appear in the light and shadow. The road to growth is not always a smooth road, just as the labor pains of rebellion will always come as expected. As the fresh power is about to break through the ancient walls and barriers, the sudden death of the mother, the sudden disappearance of the sister, and the increasing worries of the father all make the teenager more convinced that he is in an old and dangerous secret, and the answer to this secret may be able to solve the ultimate mystery of the mysterious power trapped in himself and his sister. (transferred from the Treehouse subtitle group)