In the Apocalypse, From Buying a Prison to Ruling America

(Reborn + No System, multiple female leads, a power fantasy with at least a little logic)

When the zombies broke out, the protagonist was taken in by an American soldier, who betrayed him and left him to die full of hatred.

Reborn, the protagonist sets out on a path of revenge, driven by his hatred of American soldiers.

Then, by a twist of fate, Fang Huai tried to improve his performance in one particular area, but accidentally ate a tiger that was an experimental subject.

This caused his body to mutate... and in the end, he became the American Beheader...