Li Jiu transmigrated to Teyvat and used his wisdom and strength to shape the world into what he wanted it to be.
He thought this peaceful life would last, but then a Parallel Worlds Comparison and Exchange System arrived.
The world he had changed was compared with the one he had left unchanged.
Beginning in Liyue: the Guili Ambush, where the mantis stalks the cicada, versus Guizhong's Fall, where the tiger is lured from the mountain.
The invincible Liyue cavalry versus the feeble armies of the other nations.
And especially the peaceful, prosperous age created by Li Jiu:
A Liyue where immortals and humans walk together, where the Yakshas drink alongside mortals; a free-spirited Mondstadt; ancient dragons soaring through the sky; an Inazuma where demons and humans coexist; and a gathering of the Raiden sisters beneath the cherry trees. Sumeru under joint rule...
The people of the parallel world couldn't take it anymore. They wrote pleas in their own blood, begging Li Jiu to come to their world...
