Can Ordinary People Become Doomsday Saviors?

[No system] + [No heroine] + [Upgrade flow] + [Power] On April 12, 2042, the sun went out, aliens invaded, and the end of the world came. Cheng Yan was informed by his ghost teammates that the human race was about to become extinct, and that future strong men were secretly dying one after another. He had no lofty ambitions, he just wanted to live. But fate never seemed to be on his side. The truth comes to the world, disasters and life and death occur, the world returns to silence in the sea of ​​stars, and civilization collapses under the black tower. How can an ordinary person save himself in order to avoid annihilation in the turbulence of time and space?