Transmigrating to the Three Kingdoms as Lu Bu: I Have a Pseudo-Apocalypse System

The two books are titled: "Transmigrating into Lu Bu: The System Mistakes the Three Kingdoms for the Apocalypse" and "Transmigrating into the Three Kingdoms as Lu Bu: I Have a Pseudo-Apocalypse System".
A modern man is transported to the Three Kingdoms period, becoming Lü Bu, who has just been driven out of Chang'an by Li Jue and Guo Si, and is bound to a system that mistakenly perceives the Three Kingdoms as an apocalypse. Killing enemy soldiers (whom the system sees as zombies) yields weapons, provisions, and medicine; creating safe zones grants daily rewards of supplies and skill points. Lü Bu surpasses human limits, sweeping across the Three Kingdoms and unifying the world!