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The sun goes out and natural disasters come. The world has entered an apocalyptic era. Floods, extreme cold, scorching heat, viruses... The human mortality rate is as high as 99%. Li Zhou died alone in his previous life due to hunger and cold. After his rebirth, the end of the world was still fifteen years away. He accidentally awakened to the scientific system and vowed to use the scientific power of the system to find out the reason for the end of the world, so that the painful experience of the previous life would never happen again. Li Zhou studied like crazy, dug deep into knowledge, and researched technology. Zero-point conjecture, Goldbach's conjecture, artificial intelligence, controllable nuclear fusion, aerospace aircraft, ion weapons, individual mechas... However, when Li Zhou followed the system instructions to activate subsequent functions of the system, he was surprised to find that this so-called scientific power did not seem to be as simple as he imagined... The Lapras beast understands all things clearly; Maxwell's Demon controls everything and reverses Yin and Yang; Zeno's turtle shrunk into space and time; ... At the same time, with the help of the system, Li Zhou also discovered that there were intriguing shadows lurking behind the doomsday disaster. ... Science reigns at the top of the palace, and all living beings bow their heads to respect its power.

Travel to a post-apocalyptic world where zombies are rampant. Yu Yan became an international student in the United States. The portable sharpshooter skill tree, you can light up the skills by killing zombies. [Siler]: When using firearms to attack enemies, the sound of gunfire will be automatically silenced. [Fatal Shot]: Fire a precise bullet at the enemy, which is determined to be a forced hit. It has a very high critical hit rate and piercing power. [Mechanical Dimension Pocket]: Can store weapons, ammunition, machinery and food. [Supernova Nuclear Explosion], [Chronospace March], [Gelboga's Fist], [Valdes Mecha], [Overclocking: All-Area Attack], [G-1 Guardian] face overwhelming zombies and mutant beasts. Countless humans struggle to survive, just to seek shelter from Yu Yan. Note: The sharpshooter skills are based on the DNF sharpshooter skills, but some modifications and additions will be made. Please don't take it too seriously, thank you.

Luo Hong accidentally got a system that can shuttle between various film and television works. From then on, he cheated on his life and started a different life. In "Kung Fu", he rescued the coolie Qiang and eliminated the ax gang. In "New Dragon Inn", he transformed into a waiter to help Zhou Huai'an repel his pursuers. In "The Shining", he changed Jack's destiny. "The Great Wall" brought hope to mankind.