Apocalypse + System awakening + playing it safe + siscon + monster conflicts + mechanical warfare + growth and leveling up.
A "cage" that keeps expanding, giant eggs falling from the sky one after another, polluted big fish, cities filled with mechanical weapons, and certificates proving that you are allowed to survive...
Qin Li was a college student. Living off the money his parents had left him, he had planned to just coast through life. But after an accident, a telephone appeared inside his head...
"What, the big fish monster and the big bird monster are fighting? Quick, let's go! If we're early, we might even be able to pick up some useful junk!"
"Back off. This is no place for you. If you take another step forward, don't blame us for showing no mercy!"
Qin Li quietly watched the group of armed men on the wall. His mind was full of questions. He had clearly placed the mechanical bomb at the designated spot as they had asked, so why were those people looking at him as if he were a monster?
"Right, I remember now. Where's my sister? Where did she go?"
"Brother Li, is there really no room for compromise? Look around you. This is all your doing!"
"Shut up. If none of you can bring yourselves to lay a hand on this filthy world, then let me bear the blame!"
Looking at the slowly opening gate in the distance, Lin Hai endured the intense pain coming from his battered body. His steps unsteady, he tightened his arms around the thing he was holding. Then, as if he had suddenly made up his mind, he walked toward the gate without hesitation.
The plot is pretty good and compact, so please give it a try, author.