[Timer: 97:40:50]
Deep within the dark sewer system, sprawling like diseased veins beneath the body of Seoul, the nineteen-year-old boy finally collapsed to his knees.
He had been sprinting continuously for agonizing minutes. It wasn't just a jog; it was a frantic, maddening dash fueled by primal terror squeezing his heart.
He gasped for air, his thin chest heaving like a broken blacksmith's bellows on the verge of exploding. His lungs burned from the lack of oxygen, and cold sweat dripped from his forehead, mixing with the black sewage water that reached his knees.
He slowly raised his head, studying the circular concrete walls coated in slimy moss and rot.
He knew these putrid tunnels, their branches, and their intersections as intimately as he knew the rough lines of his own palms. This filthy sewer had embraced him on freezing winter nights when society had expelled him from everywhere above ground. It was his only refuge when humanity had abandoned him.
The cruel irony now was that this despised place—a place humans couldn't even stomach thinking about—had become the safest sanctuary on a dying planet.
The countdown continued to drop with cold, mechanical neutrality in the corner of his translucent retinal display. He didn't care about his life, but he certainly wasn't ready to surrender it as a cheap meal for some mindless beast.
However, this relative underground peace didn't last long.
Terrifying rustling sounds and muffled growls began echoing through the tunnels, amplified by the concrete walls into a nightmarish resonance. Some monsters—perhaps those that favored the dark or possessed smaller frames—had found their way down through broken ventilation shafts.
They began tearing apart any living creature in their path, whether it was a giant rat, a stray cat seeking shelter, or even sewer insects.
Up above, the situation was rapidly deteriorating into a one-sided slaughter.
The human prey was no longer enough to satisfy the predatory instincts of these infinite entities. The larger, more dominant monsters began devouring the weaker ones to sate their hunger, establishing absolute dominance over their new territories in the ruined streets.
An entire alien food chain had been imported to swallow the Earth whole.
It felt as though the world had already ended, that humanity had been wiped from existence in a mere two hours. Yet, despite the gruesome massacres that turned the streets into open slaughterhouses, the human population hadn't even been reduced by half.
The reason was simple: human herd instinct, and world governments that had secretly prepared for doomsday scenarios.
Millions of citizens, especially in major cities, had been evacuated to military bunkers and subterranean tunnels designed to withstand nuclear strikes and biological attacks. These massive steel structures provided a temporary shield against alien fangs and claws.
But right here, at this very moment, a problem far bloodier and more realistic than the invasion itself emerged... a severe lack of space.
The bunkers were designed for specific capacities. The thick steel doors were sealed shut the second they reached maximum occupancy, leaving thousands outside, screaming and pounding their bare hands against the cold metal. Staying outside meant certain, inevitable death.
Outside a packed bunker in the heart of Seoul's commercial district, the scene was heart-wrenching.
Thousands of people surged like waves, crushing each other to reach the reinforced glass and steel gates. Amidst this overwhelming chaos, a man in his thirties arrived. He was panting heavily, fresh blood covering his face and entirely shredded clothes.
He had run a massive distance, bypassing the dismembered corpses of his neighbors and friends, and human limbs scattered everywhere on the sidewalks.
His eyes held the look of a man who had stared into hell and miraculously escaped. He pushed through the crowd with desperate force, finally reaching the gate, only to receive a cold, shocking response from the armed military guards inside.
"There's no room. Step back or we will open fire!"
The thirty-year-old man froze in place, as if struck by lightning.
He looked at the packed crowd behind the reinforced glass—those looking back at him with a mix of pity and profound relief that they were inside while he was out. He looked down at his trembling hands, stained with the blood of the family he couldn't save.
Then... he began to laugh.
It wasn't a normal laugh. It was a hysterical, broken, and manic cackle that shredded the desperate silence and rose above the sound of crying. It was the sound of his mind shattering into a thousand irreparable pieces.
"Fine..." the man whispered hoarsely, his eyes widening with pure madness that had completely severed ties with sanity. "I'll make some room for myself, then."
He reached his trembling hand into his pocket and pulled out a long, sharp knife. Without a single ounce of hesitation, without a drop of remorse in his eyes, he spun around toward an old man standing right next to him, who was crying and begging the guards to let him in.
Squelch!
The cold blade plunged directly into the old man's heart, piercing the ribs and shredding the left ventricle.
The old man gasped in shock, his eyes widening in disbelief that his end came at the hands of a fellow human, not a monster. Hot blood gushed out, soaking the younger man's hands. Screams of sheer terror erupted from the surrounding crowd as they scrambled backward, trampling one another.
"What are you doing, you maniac?!" screamed a middle-aged woman, stumbling backward over her torn purse.
The man yanked the knife from the old man's chest, letting the dead weight drop to the asphalt. He turned to the woman, offering a terrifying smile that revealed teeth speckled with blood spray, and waved his stained blade.
"I'm reducing the numbers. I'm making room."
Before the panicked crowd could even process the moral shock and brutality of what had just occurred, and before the guards could even raise their rifles toward the man, everyone froze in place. Time stopped once again.
Ding!
The cold, mechanical voice of the System—devoid of any human inflection—pierced the minds of humanity once more.
But this time, it wasn't just a routine server update. It was a demonic announcement, meticulously designed to shred whatever remained of the human social fabric.
[Timer: 97:05:00] [System Notification: A Cosmic Overlord is watching closely and is amused by your desperate struggle for survival.] [They have decided to grant you a "Gift".]
Breath hitched in every bunker, on every street, and in every dark basement around the world. A Cosmic Ruler? A gift? Were they sending an army of angels to save them? Would they halt the invasion?
But the glowing blue words that followed shattered every last ounce of hope.
[New Cull Rule #1: Any individual who kills 10 of their own species will be granted an Aura of Safety, making them invisible to monsters for 10 hours.] [New Cull Rule #2: For every one million humans that die, 10 minutes will be deducted from the total Cull timer.]
Silence. A suffocating, thick silence blanketed the Seoul bunker, and the bunkers of New York, London, and Tokyo.
Everyone read the message over and over, desperate to ensure they hadn't lost their minds. Ten people. Kill ten of your own kind, and you survive for ten full hours! And if millions die, this ticking hell will end faster.
The System didn't ask them to fight the monsters. The System explicitly demanded they exterminate each other.
The mechanical echoes of the notification had barely faded from their minds when the blood-soaked man raised his knife again. He blinked, staring at the phantom screen where a small counter had suddenly appeared:
[Kills: 1/10]
The System had counted the old man as his first victim.
But this time, the thirty-year-old man was no longer alone in his madness.
The looks of profound despair and sorrow in the eyes of the crowd outside the bunker—and even those inside—shifted in a single second into a murderous, rabid greed. A pure, stripped-down desire to survive.
The System had handed them a magic solution. If the outside was filled with invincible monsters, the inside was filled with weak humans. And human flesh was much easier to tear.
The area erupted into screams. Screams born not from the fear of aliens, but from the terror humans felt toward one another.
The thirty-year-old man began stabbing wildly, slashing and butchering, burying his blade into the necks of unarmed men and women like a butcher slaughtering sheep in an abattoir.
The law was gone. The very opportunity that had brought them together in one safe place seeking survival transformed in an instant into a mass execution ground. A field court where survival belonged only to the strongest and the most despicable.
A massive businessman strangled a teenager standing next to him in cold blood. A father killed his adopted son to ensure the survival of his biological daughters. A neighbor choked the neighbor who had shared food with him hours earlier. Mothers used their heels to smash the skulls of anyone who got too close.
The bunkers and their fortified entrances turned into literal rivers of blood. Sticky red seas coated the sidewalks and cascaded toward the drainage systems.
The Cosmic Ruler had told a sarcastic joke, and humanity was the punchline.
Down below, in the dark tunnels where our young protagonist hid, the eerie quiet was beginning to lift.
As he sat leaning against the cold concrete wall, a warm, sticky drop fell onto his cheek. He wiped it with his hand and brought it to his nose. It wasn't sewage water. It was fresh blood.
Drops of human blood began seeping through the cracks in the concrete ceiling, one after another, falling into the stagnant water and dyeing it a dark crimson. It wasn't just a drop or two; blood was raining from the streets that had turned into slaughterhouses above his head.
The air in the tunnels became incredibly heavy, saturated with the metallic scent of rust and pure death.
And as the blood bled from the ceiling of his city, the fumes from nuclear explosions and lethal radiation outside slowly began to creep in through the broken ventilation shafts, making oxygen a rare currency at the bottom of this world.
The young man closed his eyes, listening to the screams of humans butchering each other above. He didn't smile, and he didn't feel sorry.
His philosophy, learned the hard way, had been entirely validated. The alien monsters weren't the ones destroying Earth right now.
Humanity wasn't just being exterminated by beasts... it was eagerly devouring itself with a savagery that far surpassed the cosmic invaders.
And he sat there, at the bottom of this cosmic stomach, watching the world slowly digest itself.