In the territory of China, there is a Kunlun Mountain, but the Kunlun in the mythical time and space is not the same as the Kunlun Mountain. Kunlun generally refers to the Shan Hai Jing era, the base of the ancient evil god Nandou, and it is also the "Heavenly Court" in common people's perception.According to ancient records, the Kunlun Heavenly Court is a world built using subspace energy. Since the evil god Nandou is a centaur, the Kunlun Heavenly Court also contains many high-tech devices from the Centaur galaxy. After the Zhuolu God War in ancient times, Nandou died and the Heavenly Court collapsed, but many wonderful things flowed into the human world, and some of them still bear the heavy responsibility of maintaining the balance of space.Kunlun without the Heavenly Court, although there is only one mountain left, it still has the function of balancing the whole world.

It is said in ancient books that a dragon has nine sons, each of which is different.But in this book, the "nine sons Yuanying" who escaped from Kunlun and almost caused a change in time and space are high-tech precision instruments. Although in Nandou's Shan Hai Jing time and space, he has never been able to grasp the secret of time travel, but some of the energy left by the system he built has the ability to travel through time. The nine sons of the dragon, Yuanying, are actually explained in a scientific way. They are nine "subspace balance instruments". The energy is different, if there is a channel, the energy will become extremely unstable, and the "nine sons of the dragon" can play the function of keeping them in peace for a while.

The catastrophe in the Legend of the Spring and Autumn Heroes is actually the result of the dysfunction of the nine balance instruments caused by natural disasters. Because of this, Ning Xiaobai and others need to go deep into different spaces and times to find them.