In the Extremely Cold Apocalypse, the Awakening Building at the Beginning Is Strengthened!

An extremely cold natural disaster is coming, and the world is plunged into the apocalypse! Chen Yuan is reborn! He went back to before the end of the world began. Once again, he actually has the system ability to strengthen buildings! So he decided to create an absolutely safe safe house! Isolate all dangerous factors. Given another chance, Chen Yuan will naturally not repeat the mistakes of his previous life! In this life, there will be resentment and revenge. Those who have hurt me before will definitely be repaid a hundredfold!