Opening the history book, the first page reads:
In 3343, a white mist swept the world. Those who inhale it will die instantly, all birds and animals will become alienated, and human civilization will be on the verge of extinction.
In order to continue the fire, countries exhausted their resources and built shelters in the mountains. From then on, human beings lost the sky and used mountains as cities and fire as suns.
People call this white mist that swallows the world - Youlan.
Ten years later, special humans who can walk freely in the mist appear. They possess strange powers and are identified as the source of Youlan and the common enemy of mankind.
Later generations called him: Youyi.
It means, Youlan's child.
