C3751 The return of the yellow springs

What was the most expensive and important thing in the Seventh Level of the Universe?

Lifespan! His one and only longevity!

To all the living beings in Seventh Level of the Universe, this was all about fighting for their lifespan, because ordinary living beings could only live up to 60 years. That was to say, once they lost the ability to work, they could only wait for death