“They’ve broken through the first line of defense! They’ll soon engage our second line of defense! We can’t hold for much longer!”

“What’s the casualty count? No, how many survivors are left?”

“We’re still consolidating the number of casualties. But based on our situation, only around three percent are likely to remain as survivors!”

The operators in the ops room were shouting over each other. The person in charge of the labyrinth, Team Leader Lee Ho-Jun, had an expression that was frozen with despair.

“Fuck!”

Everything was complete chaos.

It had been only twenty minutes since the mysterious group had invaded the labyrinth, and already, the first line of defense had fallen. Even with their heavy military-grade firearms and a carefully selected group of explorers on the front lines, they couldn’t even last twenty minutes.

“Our defensive weapons aren’t working at all!”

“The invaders have clashed with the second line of defense, the bunker line! They couldn’t hold on! The line has been broken!”

The defensive measures that could fend off even 6th Floor creatures were taken down in a blink of an eye. The decision the humans had made to widen the passageway in order to maximize their firepower had come back to bite them.

Based on the data gathered...