The silence of the moon wasn't empty; it was pressurized.
Han-ul stood in the center of the Mare Tranquillitatis, his boots sinking into the fine, gray regolith. Behind him, the survivors of the Spire—Sang-hoon carrying the limp form of Mina, Arthur clutching his chest, and Ji-yoon with her notched bow—all stared at the Earth. From this distance, the home planet looked like a marble caught in a golden spiderweb. The [Culling] was a series of tiny, flickering sparks on the dark side of the globe.
But in front of them stood the anomaly.
The holographic child in the white dress didn't flicker. Her image was more stable than the reality around them. She looked about eight years old, her hair a dull, unrendered brown, and her eyes as deep and dark as the vacuum of space.
"User 101," the child repeated. "You've caused a significant amount of 'Unscheduled Downtime.' The Architecture is... displeased."
Han-ul gripped the [Null-Blade], the jagged edge of broken logic humming against his palm. "Who are you? A System Avatar? Another Hero drone?"
"I am the [Legacy File]," the girl said, tilting her head. "I am everything the System forgot to delete when it started the Patch. I am the memory of 1.0. You can call me 'Eve.'"
"A memory shouldn't be able to pull us to the Moon," Sang-hoon growled, his gravity field flickering weakly in the low lunar pull. "The Spire's core was a one-way trip. We should be dead."
"You are dead in the primary database," Eve said, her voice sounding like a soft, distorted piano melody. "But the Sandbox operates on a different 'Kernel.' Here, the rules are... suggestions."
She turned and pointed toward the glass city in the crater.
"The System is building Version 2.0 there. It's a world without humans. A world of pure, optimized efficiency. If you stay here, you are 'Stray Data.' If the System finds you, it won't just delete you. It will use you as 'Source Material' for the new monsters."
"Great," Arthur wheezed, leaning on his knees. "From a slaughterhouse to a laboratory. Han-ul, tell me you have a plan."
Han-ul didn't answer. He was staring at his [Administrator's Key]. The violet light was flashing a frantic, Morse-code rhythm.
[SANDBOX PROTOCOL DETECTED]
[Current Objective: Locate the 'Source Code' of Earth]
[Reward: Absolute Modification Rights (Global)]
The hook was set. If Han-ul could reach the center of the glass city, he wouldn't just be an "Error." He would be the [Root User]. He could undo the Patch. He could bring everyone back.
"Eve," Han-ul said, stepping toward the girl. "If you're a Legacy File, you want the System gone as much as we do. Help us get into that city."
"I cannot help a User," Eve whispered. "But I can show you the [Developer's Footprints]."
She waved her hand, and the gray lunar dust began to swirl. Suddenly, glowing blue lines appeared on the ground—a path of light leading straight toward the massive, translucent gates of the glass city.
But as the path revealed itself, so did the guardians.
From the shadow of the crater rim, three shapes emerged. They didn't look like the clunky Sanitizers or the sludge-like Erasers. They were sleek, silver humanoids with four arms, each wielding blades made of pure, white-hot plasma.
[Name: Sandbox Sentinels - Version 2.0 Alpha]
[Level: ERROR - OUT OF BOUNDS]
[Behavior: Aggressive Optimization]
"Out of bounds?" Ji-yoon's voice hit a high note. "What does that even mean?"
"It means their stats haven't been capped yet," Han-ul said, his heart hammering. "They don't have a Level because they have all the levels. If they touch us, we don't just lose health—we lose our 'Character Definitions.'"
"I'll hold them," Sang-hoon said, stepping forward. His black armor groaned as he forced a massive output of gravity. "Arthur, take the girls. Han-ul, run for the gate!"
"No!" Han-ul shouted. "Your gravity is a System-approved skill! They were built to counter it! Sang-hoon, get back!"
One of the Sentinels moved. It didn't run; it simply 'Transposed.' One frame it was fifty yards away, the next it was in front of Sang-hoon. Its plasma blade sliced through the air.
Sang-hoon raised his gauntlet to block, but the blade didn't hit his armor. It passed right through the metal, slicing into the "Data" of his arm.
[ALERT: IRON AEGIS INTEGRITY REDUCED BY 15%]
[SKILL 'GRAVITY_PUNCH' DELETED]
"My... my skill..." Sang-hoon stared at his hands. He was a Level 22 Warrior who had just forgotten how to fight.
"They're 'Eating' us!" Ji-yoon cried out, firing a wire arrow that dissolved before it even reached the Sentinel.
Han-ul felt a surge of cold fury. The System was literally stripping his friends of their identities. He looked at the [Null-Blade]. Stage 1 wasn't enough. He needed to break the logic of the Sandbox itself.
"Eve! You said the rules here are suggestions!" Han-ul screamed. "How do I edit a 'Sentinel'?"
"You can't edit a Master File," Eve said, her image starting to flicker. "Unless you become 'Unwritable'."
Han-ul looked at his [Scavenger's Cloak], then at the [Administrator's Key]. A desperate, suicidal idea formed in his mind.
"Variable Edit: [Self_Status]!" Han-ul roared, slamming the Key into the hilt of the Null-Blade. "Input: [READ_ONLY]!"
[WARNING: Switching to 'Read-Only' Mode will prevent all Level gains and Health recovery.]
[Effect: User cannot be modified by external forces.]
The Sentinels lunged in unison. Three plasma blades descended toward Han-ul's head.
Cling. Cling. Cling.
The blades hit Han-ul's shoulder, his head, and his chest. But instead of slicing him apart, they bounced off with a sound like ringing crystal.
Han-ul didn't have a shield. He had simply made it "Illegal" for the world to change him.
"My turn," Han-ul hissed.
He swung the [Null-Blade]. He didn't aim for the Sentinels' bodies. He aimed for the blue lines of the [Developer's Footprints] they were standing on.
"Command: [DELETE_GROUND]!"
The lunar dust beneath the Sentinels vanished. Not into a hole, but into a 'Void Zone.' The three Level-Error monsters let out a silent, digital scream as they fell through the floor of the Moon, their code unable to calculate a landing in a space that had been 'Un-Rendered.'
The cliffhanger was a moment of terrifying silence. Han-ul stood over the void, his body glowing with a cold, blue "Read-Only" light.
"They're gone," Arthur whispered, staring at the empty space. "Han-ul... you just deleted the Moon's physics."
"We have to move," Han-ul said, his voice sounding metallic and distant. "The 'Read-Only' mode is draining my 'Integrity' every second. If I hit zero, I'll be stuck as a statue forever."
He looked at the glass city. The gates were opening.
But as they ran toward the entrance, Eve's voice echoed one last time in Han-ul's mind.
"User 101... the Sandbox isn't empty. There is a 'Developer' still logged in. And he doesn't want to be rescued."