My God-Level System Can Rebuild Civilization in the Apocalypse!

After the world suddenly transforms into a deadly survival game, ordinary office worker Joo Joowon finds himself trapped inside his apartment complex during a midnight zombie outbreak. With only a fire axe, a frightened stray cat, and a strange game system in front of his eyes, Joo Joowon must learn how to survive in a world where humans level up by killing monsters. But while others fight in groups, Joo Joowon starts alone. As the apocalypse spreads and civilization collapses, Joo Joowon realizes survival alone is not enough. With the mysterious system guiding his growth, he begins gathering survivors, building safe shelters, and reclaiming the ruined city from endless waves of zombies. From a powerless office worker hiding in a small apartment, Kang Woo slowly rises to become the leader of a new civilization in a world where humanity must start over from zero. — Description from novelcodex.org