The last thing Kang Dohyun remembered was the Demon Lord's sword going through his chest.
It had been a clean thrust, precise and almost surgical, the kind of killing blow that acknowledged respect between warriors. The Demon Lord had looked him in the eyes as the blade punched through his sternum, and there had been something close to regret in those ancient, terrible eyes.
"You fought well, human," the Demon Lord had said. "Better than the others. But not well enough."
Behind Dohyun, the last line of humanity's defense was crumbling. Seoul, what was left of it, burned on the horizon. The barrier generators were failing. The S-rank hunters were dead or dying. Twenty-four years of war since the Global Awakening, and this was how it ended: not with a bang, but with the quiet, efficient slaughter of the last soldiers standing.
Dohyun had coughed blood, gripped the blade in his chest with both hands, and said the only thing that seemed appropriate: "Go to hell."
Then darkness.
Then light.
Then an alarm clock screaming at 6:30 AM, and the smell of his mother's cooking, and a ceiling he hadn't seen in twenty-four years.
---
Dohyun sat up so fast he fell out of bed.
He hit the floor of his childhood bedroom — *his childhood bedroom* — with a thump that rattled the model airplanes hanging from fishing line on the ceiling. His hands went to his chest. No wound. No scar. His body was small. Young. Unburdened by twenty-four years of war.
He looked at his hands. Smooth. Uncalloused. The hands of a boy who'd never held a weapon, never dragged a wounded comrade through a dungeon break, never dug graves in frozen ground because the mana-contaminated soil wouldn't accept the dead.
Eighteen. He was eighteen.
The calendar on the wall confirmed it: March 15th, 2026. The day of the Global Awakening — the day the System appeared, dungeons manifested worldwide, and approximately four percent of humanity awakened with supernatural abilities.
Dohyun sat on the floor of his teenage bedroom and processed information the way he'd been trained to: facts first, feelings later.
Fact: He had died. The Demon Lord had killed him on March 15th, 2050, exactly twenty-four years from today.
Fact: He was now back in his eighteen-year-old body, on the day everything started.
Fact: He remembered everything. Every battle. Every loss. Every strategic failure, every dungeon break that caught them off guard, every alliance that crumbled, every betrayal that cost thousands of lives. Twenty-four years of war, compressed into the mind of a boy who should know nothing.
Fact: He had a chance to change it all.
"Dohyun-ah! Breakfast!" His mother's voice from downstairs. Alive. She'd died in the Seoul Dungeon Break of 2031, five years from now. Crushed under a collapsing building while trying to evacuate civilians.
Dohyun pressed his palms against his eyes and breathed. The soldier in him, the Sergeant who'd commanded fifty men through hell, locked the grief away in the same place he stored every unprocessable emotion. There would be time for feelings later. Right now, there was work to do.
He stood, looked at himself in the mirror — young, thin, unmarked — and began composing the War Manual.
---
The War Manual was not a physical document. It was a mental framework, a comprehensive strategic plan built from twenty-four years of hindsight, organized by date and priority.
Dohyun sat at his desk with a notebook and began writing the first entries while eating the breakfast his living mother had made. The pen shook in his hand. He ignored it.
**WAR MANUAL — PRIORITY TIMELINE**
**Year 1 (2026): Foundation**
- Global Awakening occurs today. Awaken with highest possible combat class.
- Acquire [Mana Perception] skill from Yeouido Park E-rank dungeon (spawns Day 3, despawns Day 7 — no one found it the first time)
- Locate and recruit: Kim Sera (future S-rank, currently bullied high school student), Lee Junho (future S-rank tank, currently in juvie), Yoo Minhee (future S-rank mage, currently a librarian)
- Prevent: The Gangnam Gate explosion (Day 45) — caused by a D-rank dungeon that escalated because no one took it seriously
**Year 2-3 (2027-2028): Growth Phase**
- Farm the hidden dungeon under Namsan Tower (discovered by accident in 2033 — seven years too late)
- Secure the Frost King's armor set from Mount Seorak dungeon (solo clear before Chinese guilds claim it)
- Infiltrate and reform the Hunter Association's corruption before it costs lives
**Year 5 (2031): The Seoul Dungeon Break**
- Original timeline: 12,000 dead, including Mom
- Prevention strategy: Destroy the dungeon core six months before it overloads
- Required: A-rank party of at least 8, specific elemental coverage
- START PREPARING IN YEAR 3
Dohyun filled twelve pages in thirty minutes. His handwriting was terrible, a soldier's scrawl rather than a student's penmanship, but the information was precise. Dates. Locations. Names. Strengths and weaknesses of allies and enemies. The exact moment when each future S-rank hunter could be found and recruited.
He'd lived through all of it. He'd watched civilization fall in slow motion, making notes in his head because someone should remember, even if no one survived to use them.
Now someone had survived. And the notes were becoming a battle plan.
---
The Global Awakening happened at 2:47 PM, exactly as Dohyun remembered.
He was sitting on the rooftop of his apartment building when the sky split open. It wasn't dramatic from a distance — no thunderbolts or earthquakes. The sky simply developed cracks, like a windshield hit by a stone, and through those cracks, mana poured into the world like water through a broken dam.
Dohyun felt it hit him. The mana soaked into every cell of his body, searching for potential, seeking the genetic markers that determined awakening. In his first life, he'd awakened as a D-rank swordsman, a mediocre start that he'd spent years grinding into relevance.
But this time, he knew something that no other awakener knew: *intent mattered.* The first thirty seconds of mana absorption were malleable — the awakened ability wasn't random, it was responsive to the user's mental state, desires, and focus. This had been discovered in 2045, five years before the end, far too late to matter.
Dohyun didn't think about swords. He thought about *command*. About leading men into battle, about positioning troops, about the war table where every decision meant life or death. He thought about tactics. Strategy. The War Manual.
The mana responded.
**[GLOBAL AWAKENING — SYSTEM ACTIVATION]**
**[User: Kang Dohyun]**
**[Awakened Class: FIELD COMMANDER (Rare)]**
**[Base Rank: C]**
**[Abilities:]**
- **[Tactical Overlay — View battlefield conditions, enemy positions, and threat levels in real-time]**
- **[Commander's Order — Issue buffs to allied units within range: +15% to all stats for 60 seconds]**
- **[Veteran's Instinct — Passive danger sense based on combat experience]**
**[NOTE: This class has high growth potential but low initial combat power. Recommended: Join a party.]**
Dohyun read the notification and nodded. Field Commander. Not the strongest starting class, not the flashiest, but the one that would let him do what he actually needed to do: lead.
In his first life, he'd been a sword that someone else swung. This time, he'd be the general.
He pulled out his notebook and made the first update to the War Manual's real-time log:
*Day Zero. Awakened as Field Commander (C-rank). Timeline impact: significant. Original awakening was D-rank Swordsman. The improved class suggests that the regression has given me an advantage beyond knowledge — the System is reading my combat experience and calibrating accordingly.*
*Tomorrow: Yeouido Park. Secure [Mana Perception]. Begin recruitment.*
*The war starts in five years. We won't be ready by then.*
*But we'll be more ready than last time.*
He closed the notebook, watched the sky continue to crack as mana flooded the world. His shoulders pulled forward, a posture his eighteen-year-old body had never learned, the hunch of a man who'd carried too many dead friends out of too many failed operations. A war no one else knew was coming. And only one soldier left who remembered how it ended.
Sergeant Kang Dohyun was back.
And this time, he had a plan.
