The End of the World Is Coming, Reborn to Stock up on Goods and Build a Fortress

There are a lot of things that a post-apocalyptic novel should include: stockpiling + decisive killing + human torture + betrayal and licking the dog + building power + building a home + building a fortress + mutation. At the beginning, he spent money like crazy. Everyone thought he was stupid, but they didn't know that the protagonist was hoarding supplies. There is no golden finger, but the protagonist himself is extremely intelligent, courageous, and values love and justice. The fortress is finally breached, and the pressure to survive remains. Various strange monsters, some of which can even be exploited by mutant humans. In the last days, money has no effect and materials are king. In order to survive, human nature is revealed. Perhaps the most difficult thing to deal with is human beings. First surviving, then wandering, migrating all the way while looking for a girl, and finally establishing a pure land under pressure.