Global Cataclysm: My Shelter Is Being Upgraded Infinitely

The Ice Age suddenly came and civilization collapsed overnight. Lin Fan was reborn one month before the disaster and was bound to the "infinite upgrade system". Ordinary water cup upgraded to unlimited water source? Upgrading a broken bike to a magnetic hoverboard? The rusty dagger evolves into a high-frequency energy blade? Time was running out, so he used the system to upgrade and transform like crazy to build an absolute fortress. But the end of the world is not only about cold and hunger, mutated monsters are raging, and mysterious hostile forces are watching. Under the seemingly abandoned mine, there is actually a shocking secret that leads to the end of the world... Can Lin Fan use his infinitely upgraded shelter to find a way out in this frozen era and uncover the truth behind the disaster? This is a ruthless epic of struggling in a desperate situation and using upgrades to fight the doomsday.