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.
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[You have received the S-rank system, Minion Controller]
[You have received 1x Woodcutter Minion and 1x Warrior Minion]
[You can buy more minions in the Shop]
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What was this?
[Your Woodcutter Minion has collected 21 wood, it is now level-2]
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As other people struggled to survive. William would be able to create an army of minions and take over this hellscape.