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