A Man in the Apocalypse, and What Is This Rogue Tycoon System?

[No NTR, apocalypse from the start, multiple women with no set pairing, invincible] In a single day, Gu Cang transmigrates to an apocalypse crawling with zombies and awakens the System that every transmigrator is supposed to have. But there’s a problem: the System seems to have the wrong settings. [Mission 1: You’ve just arrived in Sin City. Try your hand at robbing a convenience store!] “Rob a convenience store? You mean that wreck downstairs, with its doors wide open and everything in shambles?” [Mission 2: Eliminate your rivals. Now take out one of your opponents!] “Take out an opponent? You mean those zombies wandering all over the streets, some of them crawling around without legs?” [Mission 3: Build up your ill-gotten wealth. Now finalize your plan to rob a medium-sized bank!] “Rob a bank? You mean that vault across the road, packed with banknotes that nobody in the apocalypse wants?” “Wait, I completed the mission just by grabbing a coin from the convenience store?” “Wait, I completed the mission just by whacking a zombie?” “Wait, I completed the mission just by scooping two bags of worthless paper money out of the vault?” As one mission completion notification after another pops up... Genetic enhancement serum, full set of interstellar armor, fantasy storage ring, chainsword and bolter set... Looking at the rewards he’d received for completing the missions, Gu Cang couldn’t help falling into thought. Bad news: My System’s mission module is bugged. Good news: The reward module is bugged too. I think I might be a little overpowered...