My OP Minion System in the Apocalypse

William Hunter was a young high-school student who was constantly bullied and made fun of by the people around him.Suddenly, one day, everyone was given a system and transported into a parallel apocalyptic world filled with powerful hordes of zombies, wrecking havoc on everyone and everything. Even with systems, most people struggle to survive.-[You have received the ???-rank system, Minion Controller][You have received 1x Woodcutter Minion and 1x Warrior Minion][You can buy more minions in the Shop]-What was this?[Your Woodcutter Minion has collected 21 wood, it is now level-2]-As other people struggled to survive. William would be able to create an army of minions and take over this hellscape