Returning to Before the Disaster, I Will No Longer Save the World

The world undergoes cataclysmic changes and strange things appear. In his last life, Chen Shan struggled to survive and saw too much suffering. On the way to becoming stronger, he chose to save others. From establishing a survival stronghold, to expanding it into a base, and then turning it into a safe enough city. Countless people were sheltered and survived. However, after Chen Shan eliminated all threats, he was regarded as the biggest threat. They need a savior, but they don't need a savior who lives on. His former subordinates attacked and killed him, but others pretended to turn a blind eye. After death, rebirth, return to the day before the disaster. Chen Shan faced a problem. Will we continue to save the world this time? No, not anymore! Human nature cannot be overestimated. This time, I will not make any mistakes again and live only for myself.