The descent into the Sub-Layer was not like climbing down a ladder; it felt like falling through a crack in a dream.
Han-ul led the way, his hand pressed against the cold, iron wall of the "Sector 4" maintenance shaft. Beside him, Choi held a flickering "Leech" lantern that cast long, jittery shadows against the walls. Behind them, the twelve freed Testers and Arthur moved in a silent, tense single file.
As they reached the bottom of the shaft, the environment changed. The concrete walls of the Seoul subway system didn't end; they simply stopped being "rendered." The floor transitioned into a flat, gray grid that stretched into an infinite horizon of darkness. In the distance, half-finished buildings stood like skeletal ghosts—some missing walls, others floating three feet off the ground.
"What is this place?" Ji-yoon whispered, her voice echoing as if the room were miles wide.
"It's the world's 'Loading Dock,'" Han-ul said, stepping onto the grid. His boots made a hollow, digital thud with every step. "The System doesn't build Earth all at once. It renders the surface in real-time. This is where it stores the 'assets' it hasn't used yet, or the ones it's currently modifying."
He checked his [Patch Notes].
[Note 14: Sub-Layer Hazards]
Note 14.1: Physics is unstable. Do not run.
Note 14.2: 'Garbage Collectors' (Level 25) patrol the boundaries.
Note 14.3: Safe Zone: The 'Zero-Point' Bunker.
"Stay on the grid lines," Han-ul commanded, his eyes tracking a massive, shimmering shape moving in the far distance. It looked like a giant, translucent eraser head scraping across the horizon. "If you step into the 'Negative Space' between the lines, the System might fail to calculate your position. You'll fall forever."
Arthur, still weak but standing on his own, looked at the half-formed structures. "I remember the System showing me blueprints of a 'New Seoul.' It looked like this. Cold. Perfect. Empty."
"It's empty because they haven't moved the 'Assets' in yet," Han-ul said. "That's why we're here. This is the only place the System's scanners can't easily reach. It's like trying to find a specific grain of sand in a construction site."
They walked for hours through the surreal landscape. They passed a forest of trees that were just gray cylinders and a lake made of untextured blue light. To the others, it was a nightmare of unreality. To Han-ul, it was a goldmine.
He stopped in front of a massive, metallic cube that sat isolated in the middle of a grid intersection. It had no doors, no windows, and was covered in glowing violet runes that pulsed in sync with his Admin Key.
"The Zero-Point Bunker," Han-ul muttered.
"How do we get in?" Director Lim asked, her breath visible in the freezing, unconditioned air of the Sub-Layer. "It looks like a solid block of tungsten."
Han-ul pulled out the [Null-Blade]. Instead of swinging it, he pressed the hilt against the cube's surface.
"Variable Edit: [Collision]," he whispered. "Input: [False]."
The violet light from the hilt bled into the cube. For a split second, the metallic wall became as transparent as water.
"Quickly! Inside!"
As the last person scrambled through the wall, Han-ul stepped in and released the edit. The wall solidified instantly, sealing them inside.
The interior of the bunker was a stark contrast to the void outside. It was filled with old-world technology—analog servers, mechanical switches, and stacks of paper maps. In the center was a large, circular table with a holographic display of Seoul, but the display wasn't golden. It was white and blue, showing the city's infrastructure in raw data.
"This... this is an old government bunker," Choi gasped, running his hands over a mechanical keyboard. "But it's been... patched."
"It was a 'Dev-Room,'" Han-ul explained, his eyes scanning the monitors. "Before the System fully integrated Earth, it used locations like this to test local physics. Because it's an 'Internal Asset,' the System assumes it's empty. It's the ultimate blind spot."
He walked to the main console and inserted the [Administrator's Key].
The room roared to life. The screens flashed with a rapid-fire sequence of code, finally settling on a map of the Gangnam Safety Zone.
[ADMIN ACCESS GRANTED: LEVEL 0.02%]
[Current Objective: Establish Glitched Kingdom]
[Scanning for Available 'Nodes'...]
"Look," Ji-yoon pointed to the screen.
Dozens of red dots were moving through the sewers they had just escaped. Above them, a massive gold icon—the symbol for a High-Tier Hero—was hovering over the Euljiro station.
"That's Lee Sang-hoon," Arthur whispered, his face pale. "The 'Iron Aegis.' He's Level 18 now. He's the most loyal of the 100. If he's there, he's already realized we didn't go up. He's looking for the shaft."
"He won't find us down here," Han-ul said, but his brow was furrowed. "But he'll find the Leeches' hideout. He'll kill everyone left behind to 'cleanse' the area."
Director Lim gripped her chair. "My people... Choi, we have to go back."
"You go back, you die," Han-ul said firmly. "But there's another way."
He looked at the console. His 0.02% access wasn't enough to delete a Hero, but it was enough to [Redirect].
"Arthur," Han-ul turned to the former leader. "If you were Sang-hoon, what would make you leave a 'Corrupted' zone immediately?"
Arthur thought for a moment, his mind returning to the rigid, logic-based training of the System. "A 'High-Priority Data Leak.' If the System thinks a 'Core Asset' is being stolen somewhere else, it will force-pull the nearest Hero to defend it."
Han-ul's fingers flew across the keyboard. He wasn't typing code; he was moving "Variables" like chess pieces.
"There's a System Vault in the Mapo District," Han-ul said. "It holds the 'Skills' for the next batch of Heroes. I'm going to trigger a 'False Breach' alert. I'll make the System believe I am there, trying to steal the skills."
"But the System will know you're not there once the Hero arrives," Ji-yoon warned.
"I don't need it to believe it forever," Han-ul said, his eyes cold. "I just need to buy us time to build our own 'Patch.'"
He hit the [Enter] key.
On the screen, the golden icon of the Iron Aegis suddenly stopped moving. It hovered for a second, then turned and began to move at high speed toward Mapo, away from the Leeches.
"He's gone," Choi breathed.
"For now," Han-ul said. He turned away from the console and looked at the twelve Testers and the survivors. "Listen to me. We have a base. We have a cloaking field. But we are still Level 1. The System is going to keep updating, keep getting stronger. If we want to survive, we need to stop reacting and start 'coding.'"
He held up the [Null-Blade].
"From today, we don't gain levels. We steal them. We don't accept blessings. We rewrite them. This bunker isn't just a hiding spot. It's the 'Source Code' of the rebellion."
He looked at Arthur. "You were the first Hero. Now, you're the first 'Glitch Knight.' Are you ready to learn how to break the world you helped build?"
Arthur stood tall, the confusion in his eyes replaced by a grim, human determination. "Show me the exploit, Administrator."
As the group began to organize, Han-ul looked back at the main screen. A new notification was blinking in the corner of the map.
[SYSTEM ALERT: Patch 1.1 Deployment in 48 Hours.]
[New Feature: 'The Eye of Providence' - All cloaking effects will be reduced by 50%.]
Han-ul's grip tightened. The System was evolving to counter him. The 500-chapter war had truly begun.