Maxed at Zero

The system gave every human on earth a level between 1 and 1000. Cass Marlowe got zero. Three years into a leveled world, she mops floors in a laundromat, watches S-rank parties clear the block outside her window, and has never once entered a portal. It's a good life. It isn't going anywhere. Then a level 700 ranger dies in her alley wearing armor that should have saved him, and Cass finds out what zero actually means. Zero does not mean nothing. Zero means the system can't touch her. Monsters walk past. Bosses don't notice. Every high-level artifact in her hands becomes a decoration. The guild wants her dead. The architects want her logged. Cass wants to keep working the early shift. A dry, slow-burn OP MC litRPG for readers who like their overpowered protagonists unbothered.