Apocalypse: I Have a Dark Zone Breakout

(Prequel to Doomsday Parallel) (No heroine + dual protagonists + system + no powers) (Newbie writing, don't comment if you don't like it) (There are tanks and armored vehicles in the later stage, and the other protagonist has a zombie lord system) (The early stage is boring and complicated, but it gets better after the middle stage) (Then let us take a look at the wonderful story of Chen Tang and Xiao Luoye)