In their previous lives, they were the sharpest blades in their organization. When they died, twin sisters transmigrated to different worlds. The elder sister, Yan Zhi, went to an ancient beast world, where males could transform into beasts and females awakened supernatural abilities. The younger sister, Yan Tu, went to a futuristic beast world ruled by technology and overrun with machines. Though separated by ten thousand years, they were bound to the same System and given the same mission: “Collect the core of the beast world and piece together the complete timeline.” They can sense each other’s thoughts, but only when one of them is at death’s door.
The only thing they can do is grow stronger, until they can cross ten thousand years and reunite.