The E-Rank Nobody

Sung Jinwoo is 25, a Korean Hunter stuck at E-rank, the bottom rung, years after his awakening. He's mocked as the "weakest hunter in the world." He clears cheap, low-level dungeons just to scrape together money for his mother Park Hae-in's medical bills (she's suffering from a mysterious "eternal sleep" illness) and to support his younger sister Jinah, who's still in school. He's also deep in debt to a loan shark. His father, Sung Il-Hwan, disappeared years earlier on a dungeon expedition and is presumed dead.

The Double Dungeon

Jinwoo joins a pickup party for a routine dungeon led by a Hunter named Choi Jong-in's associates (later, various party members). Inside, they find a second, hidden gate: a double dungeon, an extreme rarity. Against Jinwoo's objections, the party's more experienced / greedy members push forward anyway, hoping for rare loot. It turns out to be filled with monsters far above their rank. The party gets massacred. Jinwoo watches allies die gruesomely. He and two survivors reach a stone ritual room with twin statues offering trials, "of the wise" (riddles) and "of the strong" (combat). They gamble on the riddles. Wrong answers get you killed by magic beams. One by one the others die from wrong guesses; Jinwoo is the last one alive, badly wounded, and collapses accepting death.

The System Awakens

He wakes up in a hospital. Doctors are baffled bc he should be dead. Soon after, a strange window only he can see pops up: a game-like System interface with HP / MP, stats (STR, VIT, AGI, INT, PER), an inventory, and quests. His very first System quest is a punishing "Daily Quest" penalty for having "insufficient qualifications" to survive: 100 days of grueling physical training (sit-ups, push-ups, squats, a 10km run daily) or face increasingly severe punishment. When he tries to skip it, the System drags him into a Penalty Zone, a pocket dimension full of goblins he must fight or die repeatedly in. He barely survives, and it permanently rewrites his physical baseline. He becomes far stronger, faster, and tougher than any ordinary human even before "leveling" properly.

Learning the Rules

Jinwoo realizes he's the only person alive with this System. Only he can level up indefinitely by killing monsters, allocate stat points, and receive quests. He starts sneaking into dungeons alone at night to grind, using low-rank gates that are beneath notice. He discovers Instant Dungeons, private, personal pocket dungeons the System occasionally offers him to farm without witnesses, letting him level up drastically without anyone seeing his real power.

Job Change and Shadow Extraction

During an Instant Dungeon based on a knight's tomb, Jinwoo battles a powerful "Knight" boss (later becomes Igris) and undergoes a Job Change quest. His class is revealed as unique, not a standard Fighter / Mage / Tanker / Healer / Assassin type, but something else entirely, initially assumed to be Necromancer-like. He gains the skill Arise, letting him reanimate defeated enemies' corpses as loyal shadow soldiers he commands. Igris becomes his first major shadow knight and one of his most trusted generals for the rest of the story.

Yoo Jinho and Early Alliances

Jinwoo meets Yoo Jinho, a rich, cowardly but good-hearted D-rank Hunter whose father owns a construction company. After Jinwoo saves him in a dungeon, Jinho attaches himself to Jinwoo out of gratitude and hero worship, eventually becoming his loyal subordinate / vice president when Jinwoo starts his own Hunter agency later. Jinwoo also crosses paths with reporter / dungeon-break survivor characters and slowly builds a small trusted circle.

The Reawakening Test

Jinwoo undergoes an official Reawakening Test at the Hunters Association to re-measure his rank. His stats blow past the measuring equipment's expected range, alarming the examiners (including a scene where the gauge / orb reacts abnormally). He's bumped up in rank but deliberately keeps downplaying and hiding just how strong he's actually become, not wanting scrutiny.

Cartenon Temple

Jinwoo joins a large, official raid into the Cartenon Temple, an ancient ruin dungeon full of puzzle mechanisms and living stone guardian statues that reflect the elemental affinities of the party fighting them. Partway through, a faction within the raid party (Hunters looking to seize a rare, extremely valuable magic artifact / orb for themselves) betrays the others, trapping and abandoning a portion of the group, including Jinwoo and a few allies, deeper in the temple. Jinwoo has to fight through the temple's culminating guardian, a powerful automaton / golem-type boss, essentially solo. He wins, extracts new shadows, and picks up cryptic knowledge hinting at the System's true origins and the being behind it.

The Demon Castle

One of Korea's deadliest known dungeons is a shifting, labyrinthine Demon Castle where the architecture rearranges itself and traps shift constantly, ruled by the demon king Baran. Multiple past raid teams have died trying to clear it. Jinwoo goes in essentially alone, navigating brutal trap floors and fighting Baran's environment-manipulating powers in a grueling final battle. He wins, kills Baran, and extracts him. Baran becomes one of his most powerful shadow generals, second only to a small handful introduced later.

Healing His Mother, Family Life

Using the wealth and rare drops from his raids, Jinwoo dramatically improves his family's situation (new apartment, financial security) and eventually obtains a rare elixir tied to a boss drop that cures his mother's mysterious illness. This thread runs throughout and reinforces his core motivation: protecting the small number of people he has left.

Cha Hae-in

Jinwoo meets Cha Hae-in, one of Korea's top S-rank Hunters, famous for an unusual ability: she can smell the "scent" of other Hunters' power level, and most strong Hunters smell repulsive to her, which has made her somewhat isolated and cold toward men in general. She's baffled to discover Jinwoo, supposedly a weak E / low rank, either has no bad scent or smells oddly pleasant to her, which doesn't fit any known Hunter type. Their paths cross repeatedly across raids and Association events; their relationship builds gradually from confusion / curiosity to respect to eventual romance later in the story.

Founding an Agency, S-Rank Recognition

Jinwoo starts his own Hunter agency (eventually named the Ahjin Guild) with Jinho as his second-in-command, giving him a legitimate cover to keep taking on dangerous, high-paying raids while building his personal power base. He officially clears increasingly high-rank content, drawing more and more attention from the Korean Hunters Association, its chairman Go Gunhee, and rival guild leaders like Baek Yoonho (a werewolf-affiliated S-rank) and Choi Jong-in (an ice-affiliated S-rank), who start to suspect there's something very unusual about this "weak" Hunter.

Red Gate Incident

This arc has Jinwoo and Jinho trapped in a "Red Gate," an unstable, high-difficulty dungeon variant that seals people inside until cleared or time runs out, alongside a group of mostly female Hunters from another party, including a young Hunter named Joohee. Trapped with monstrous ice / frost wolf-type creatures, Jinwoo has to protect the group while (as usual) hiding the full extent of his abilities, only cutting loose when things get desperate.

Jeju Island: the Ant Arc

This is the story's biggest early turning point. Jeju Island, long overrun by monstrous ant-type creatures, is invaded by an S-rank raid team from Japan attempting a large-scale clear. They're all but wiped out by an unexpectedly intelligent, monstrously powerful Ant King. Korea then commits its own elite team, nicknamed the "Jeju Ant Men," made up of veteran S-rank hunters who'd fought the ants there before. They, too, are slaughtered, a national tragedy that shakes Korea's Hunter community.

Jinwoo decides to go to Jeju Island himself, secretly, deploying his shadow army to methodically clear out the ant colonies. He eventually confronts the Ant King directly in an extremely close, brutal duel, arguably the most dangerous fight of his life to that point. He's grievously wounded, nearly dying multiple times, but manages to land the finishing blow at the very last possible moment. As he's dying from his wounds, the System offers him the option to extract the Ant King as a shadow before he loses consciousness. He does. The Ant King is reborn as Beru, an incredibly powerful, fiercely loyal shadow soldier who becomes something like Jinwoo's marshal / right hand for the rest of the series, often the strongest single unit in his shadow army alongside a few others gained later.

Jinwoo survives, barely, thanks to healing potions/items. This arc is the point where hiding his power stops being feasible; his involvement in resolving the Jeju Island crisis becomes impossible to fully conceal.

National Level Hunter

Following Jeju Island, Jinwoo is elevated to National Level Hunter, Korea's highest official classification, reserved for individuals whose personal power can single-handedly affect national security. This puts him in direct contact with the Hunters Association's inner circle and with other countries' National Level Hunters, most notably Thomas Andre (America), Christopher Reed (referenced among the American Hunters), and China's Liu Zhigang, among others, as international incidents involving Gates and monsters increasingly require top-tier Hunter cooperation.

Kamish's Wrath and the Dragon Threat

An ancient, extraordinarily powerful dragon named Kamish, associated with Monarch-tier threats, becomes a major obstacle later in the story. Jinwoo, now vastly stronger, fights and kills Kamish in one of his hardest battles, then extracts it as a shadow, drastically boosting the top-end firepower of his shadow army. (There's also a side-thread involving a Kamish's Wrath weapon / dragon fear item and dragon eggs / hatchlings tied to raid content, depending on version of the story, that ties into national-level raids.)

The Architect and the Rulers

The cosmology of the story deepens: the surge in Gates, monsters, and the overall crisis on Earth is revealed to not be random; it's fallout from an ancient, ongoing war between two factions of near-omnipotent beings: the Rulers and the Monarchs. The Rulers present themselves as guardians trying to stop the Monarchs from conquering worlds like Earth, and they communicate with select Hunters (including Jinwoo) through cryptic "messenger" figures, most notably one who appears as a clown-like or masked being who nudges Jinwoo and other National Level Hunters toward key confrontations.

It's revealed that a Ruler known as the Architect has been engineering much of what's happened, including the System itself, and has been quietly steering Jinwoo's growth for a long-term purpose the Rulers haven't fully disclosed.

Ashborn and the Shadow Monarch

The truth of Jinwoo's class comes out: he isn't merely a Necromancer-type; he's a vessel / successor for the Shadow Monarch, one of the Monarchs from the ancient war, a being named Ashborn. Ashborn has been slowly dying / fading for a very long time and has been using the System (an extension of his own power, possibly sanctioned or manipulated by the Rulers) to cultivate Jinwoo as the next Shadow Monarch, so that his legacy, and the fight against the Rulers, can continue. This reframes much of what's happened to Jinwoo throughout the story as engineered, not accidental.

Sung Il-Hwan Returns

Jinwoo's father, long thought dead, is revealed to have survived his disappearance, trapped for years in another dimension / plane connected to the Rulers, where he was transformed and empowered, becoming a Ruler-affiliated Hunter of his own, wielding light / holy-type power. His eventual return to Earth and reunion with Jinwoo is fraught; he's not entirely the man he was, and his allegiance to the Rulers' agenda puts him at odds with his son, leading to a painful, emotionally charged confrontation between them.

Global Monarch Invasion

The story escalates into a full worldwide crisis as multiple Monarchs, each master of a distinct domain (among them figures tied to Frost, Plague, Beasts, White Flame/Transfiguration, and others), begin manifesting and invading different regions simultaneously, each seeking out and targeting the strongest local Hunters to fight and absorb power from. Entire cities become battlegrounds. National Level Hunters across the globe are forced into desperate, world-shaking fights against individual Monarchs, several are gravely wounded, some die.

Jinwoo, having by now essentially become Earth's strongest single asset, mobilizes his full shadow army (Beru, Igris, Baran, Kamish, Tank / Iron, Greed, Tusk, and many others accumulated over his career) to reinforce threatened regions, including traveling to support fellow National Level Hunters like Christopher Reed and Liu Zhigang against the Monarchs invading their territories.

Antares, Monarch of Destruction

The strongest of the Monarchs, Antares, launches an overwhelming, direct assault targeting Seoul and Jinwoo personally, the single largest-scale battle in the series, leveling large portions of the city. The fight pushes Jinwoo completely past his limits, forcing him to fully merge with Ashborn's remaining power and will, effectively completing his transformation into the true Shadow Monarch in order to stand a chance. He wins, but at enormous personal cost.

The Rulers' True Agenda

With the Monarch threat largely broken, the deeper truth comes out: the Rulers have been orchestrating the entire cycle of conflict, using both Monarchs and human Hunters as disposable pieces across countless parallel worlds in a repeating cosmic "game," grooming champions like Jinwoo purely as weapons to be used and discarded once they've served their purpose.

The Final Confrontation

Refusing to be a pawn, Jinwoo, now wielding his complete shadow army and fully realized Monarch power, pushes into the Rulers' domain directly, culminating in a final showdown with the Architect, the Ruler who has manipulated events from the very beginning. It's the story's ultimate battle, testing everything Jinwoo has built across the entire series.

The Ending

Jinwoo wins, breaking the cycle the Rulers had trapped Earth (and other worlds) in, at great personal cost. He emerges as the single strongest being in the setting, a fusion of ordinary human will, System-given power, and Monarch authority. The Gates and dungeon crisis is finally resolved. The epilogue shows him returning to a quiet, peaceful life: his mother healed, his sister safe and grown, Cha Hae-in by his side, and his shadow soldiers / family around him, closing the story on him finally getting to live for himself, not just for survival.