Upgrade: I Have Immortality

Due to global warming causing chaos in global ocean currents, the world has entered a new ice age. Humanity is gradually dying out, leaving only a handful of humans alive... Hundreds of years later, the world began to recover, mankind got out of trouble and began to build a new civilization. Zhu Tian traveled from before the New Ice Age to hundreds of years later, facing a new world. In the new world, Zhu Tian has an unreliable system. Let's see how Zhu Tian reaches one peak after another in this new civilized world... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.