Lee Hyunsung

Lee Hyunsung is a soldier whose search for legitimate orders develops into a freely chosen duty to protect Kim Dokja's Company. His steel is not merely a defensive element: its strength repeatedly depends on the convictions, memories, and relationships he is willing to preserve.

Biography

A Soldier After the Chain of Command

Hyunsung enters the scenarios as a Republic of Korea Army first lieutenant with a crew cut, an imposing build, and the instinct to restore order by announcing his rank. That instinct briefly gives frightened passengers something familiar to trust, but the ruined subway has no functioning command structure capable of answering him. His initial attribute, Soldier Who Turned a Blind Eye to Injustice, makes the problem personal as well as institutional: military obedience has left him with unresolved guilt. He wants to protect civilians, yet he is reluctant to assume that every stranger must become an enemy merely because the scenario rewards suspicion. Kim Dokja's knowledge therefore becomes a provisional source of direction. Hyunsung follows his instruction to use Great Mountain Push, carries Lee Gilyoung during the escape, and supplies the discipline that lets a collection of survivors begin acting like a party. (Chapters 4–21)

That dependence on sound instructions changes in Chungmuro. When Hyunsung sees the Landlord Coalition abusing a woman under Gong Pildu's coercive Green Zone order, he initially asks for permission to intervene—the reflex of a soldier accustomed to authorization. He then acts because he has decided the abuse is wrong. Declaring that he wants to practice justice freely, he releases Great Mountain force against the coalition and destroys the private land on which their control depends. His attribute evolves into the Man Who Regained Justice, marking the first time his power grows from a moral decision made without a superior's command. He continues to respect Dokja's judgment and later accepts Yoo Joonghyuk's battlefield direction, but this awakening establishes the principle behind his strongest moments: protection is meaningful only when he accepts responsibility for choosing it. (Chapters 30–35)

Finding the Third Answer and Proving His Steel

Nirvana's Thought Infection forces Jung Heewon into a berserk state and turns her Hell Flames against Hyunsung. The apparent choices are brutally simple: kill her, or flee until the flames consume her. Dokja initially says there is no third method, but Hyunsung cannot accept an answer that saves him by treating Heewon's death as unavoidable. His attachment to her is not yet something he can comfortably name, and the situation also exposes how often he has treated the army, the country, and Dokja as manuals that could decide in his place. He rejects the order to retreat, runs through the flames even as his limbs are destroyed, and chooses to risk dying beside her rather than survive by abandoning her. This is not blind confidence; he moves without knowing whether an alternative exists because the two authorized answers are morally intolerable to him. (Chapters 137–138)

The decision earns the attention of Master of Steel and begins Proof of Steel. With Dokja helping bear the sponsor narrative, Hyunsung activates an incomplete Steel Transformation and endures repeated heating and quenching. The metal does not make him immune to Heewon's fire: it melts, burns his insides, and must be sustained through will while he is still learning how to control it. He eventually encloses Heewon inside a wall formed from his transformed body, starving the fire of oxygen, and holds her until the infection breaks. He saves both of them, completes the first proof, and begins inheriting the steel Story. The rescue also changes his relationships. Trust in Dokja now includes the right to refuse him, while his early front-line coordination with Heewon becomes an intimate bond founded on bearing pain together. Steel consequently acquires its lasting meaning for Hyunsung: not invulnerability, but the chosen capacity to receive harm that would otherwise reach another person. (Chapters 138–162)

The Company's Shield Learns Not to Lose the Safety Pin

The Dark Castle makes Hyunsung confront the limit of protection when the scenario identifies the transformed Dokja as the 73rd Demon King. He refuses to attack his companion and fears, correctly, that Dokja's promise to return may conceal another sacrifice. Only when the scenario leaves the party no survivable alternative does he strike through tears. After Dokja disappears, Hyunsung returns to the army because its routines are among the few structures he knows for containing grief. He does not remain static there. Sponsor trials, combat, and continued training raise his synchronization with Master of Steel far beyond that of comparable incarnations in other regression turns. By the Demon King Selection, he can return as one of the reinforcements capable of shielding Dokja from narrative-grade constellations rather than as the subordinate who once needed every step explained. (Chapters 187–265)

His reunion with Dokja reveals the emotional logic beneath the growth. Hyunsung compares him to a grenade's safety pin—an awkward military image expressing that the group cannot keep discarding the piece that prevents catastrophe. When Dokja asks to be thrown through Surya's defense, Hyunsung initially refuses because the plan sounds like another expendable-cartridge promise. He cooperates only after making the risk mutual: if Dokja's assurance is false, they will die together. Hyunsung charges while his steel cracks, helps open Surya's defense, and throws Dokja through the gap for the winning strike that contributes to Demon Realm's Spring. During the next three years, the company continues training without Dokja, and Hyunsung brings Steel Transformation close to mastery. His loyalty has become neither passive obedience nor solitary martyrdom; he follows plans while openly negotiating who will bear their cost. (Chapters 265–395)

Becoming the Steel Sword and the Greatest Shield

At Gigantomachia, the title Steel Sword becomes literal. Once Steel Transformation reaches level ten, Hyunsung can reshape himself into a living weapon whose accumulated Stories make him harder than ordinary metal and allow damaged portions to regenerate. Giant Soldier Pluto wields this form against Heracles, and Heewon's Hellfire later heats it into a sacred torch. The achievement greatly expands his usefulness, but it also creates a danger that has followed his defensive identity from the beginning: a person who always offers his body can be reduced to equipment. His weapon form works because he consciously entrusts himself to companions, not because he has ceased to be a person. The same distinction governs his Story with Heewon, Sword and Shield. He stops vessels and absorbs attacks while she uses the openings, platforms, and reach he provides; neither role is complete without the other's agency. (Chapters 330–395)

The Great War of Saints and Demons pushes that partnership past its safe limit. When Barbatos fires Star Destruction Bullets at Heewon, Hyunsung repeatedly covers her even after admitting that his steel cannot endure indefinitely. His heart hardens into pure steel and stops beating, ending Sword and Shield's storytelling and leaving him in the fifth, final stage of Steel Transformation. He is alive, but trapped in a long slumber in which consciousness, body, and weapon identity no longer align. Heewon remains beside him, recognizes his brief awakening when he becomes the sobbing Steelsword, and carries him into Journey to the West rather than leaving him as a hospital relic. Wielded by her, his enlarged blade and her God Slaying can destroy a fleet, yet every victory reinforces the need to recover the man inside the strongest shield. His sacrifice saves Heewon; its consequence is months without an ordinary heartbeat or independent human form. (Chapters 395–437)

The Heart of Steel and a Duty Freely Chosen

Healing alone cannot wake Hyunsung because his fifth-stage slumber is a crisis of memory and identity. Kim Dokja's Company travels to Oz, where his soul is entangled with the planet and the history of the 999th turn. Inside a military-memory experience, he has forgotten his companions and retreated into the manuals that once defined him. Fragments of their voices restore the fear his hardened heart was suppressing: not fear of pain, but of forgetting the people he failed or promised to protect. The original Master of Steel's Story has passed through the distinct 999th-turn Lee Hyunsung, whose inherited will helps the main-world Hyunsung face his own choice. Warned that a protector's heart may ache eternally whenever protection fails, he accepts the pain because having no opportunity to protect anyone would be worse. (Chapters 459–464)

Hyunsung awakens the Ruler of Steel as his own interpretation of the inherited Story and releases Last Steel across Oz, covering the planet in Story metal while the company defends him. He identifies himself as Captain Lee Hyunsung and immediately reports his discharge from active service. The declaration does not reject discipline, comrades, or public duty; it separates those chosen commitments from institutional identity. He returns to the Final Scenario as a person rather than a weapon, spreading steel over companions and equipment while Lee Seolhwa repairs the damage transferred to him. After the apparent ending, he joins the attempts to recover the missing portion of Dokja, opens the subway route with Great Mountain Push, and holds back the Final Wall's hounds. Even after repeated hopes fail, he contributes his memories to Han Sooyoung's novel. The Star Stream's later collapse causes Skills, Stigmata, and Story voices to fade, so his final state is not permanent peak armor. What remains certain is the duty he chose, the relationships he recovered, and his willingness to act without waiting for another manual. (Chapters 464–551)

Appearance and personality

Hyunsung is introduced with a neatly trimmed crew cut, a muscular frame, and a height that places him roughly a head above most of the subway passengers. His calm voice and military identification initially project dependable authority. Later descriptions compare his large body to a bear, an image used both for his physical power and for gentler moments: his arms can surround Heewon without immediately touching her, he carries younger companions with ease, and even his unrestrained sobbing is described through the contrast between his imposing frame and open emotion. Steel Transformation progressively replaces flesh with Story metal, while its final stage hardens even his heart and allows his whole body to become a sword. (Chapters 4, 139, 399, 435, and 516)

He is polite, earnest, and literal-minded. Complicated feelings often emerge through military objects and procedures because those are the vocabulary he trusts: Dokja becomes a safety pin or spent cartridge, an awakening becomes a report, and the recovery of his autonomy culminates in a formal discharge. The metaphors can be unintentionally funny, but they are not empty jokes. They let him say that a companion is indispensable, that an order feels wrong, or that an old identity no longer owns him. He is also easily flustered by intimacy, susceptible to alcohol, and markedly gentler than the severe image attached to the Steel Sword title. (Chapters 111, 139, 154, 265, and 465)

His courage is endurance rather than fearlessness. Hyunsung is often confused, frightened, embarrassed, or uncertain about the correct action; he advances because he has decided that leaving another person to suffer would be worse. He cries during reunions, weeps while forced to attack Dokja, and sobs when he believes the scenarios have finally ended. These reactions do not contradict his durability. They explain it: his steel is strongest when he remains emotionally connected to the people receiving his protection, and it becomes dangerous when the role of shield suppresses the heart and identity that chose it. (Chapters 138, 187, 265, 396, 464, and 516)

Abilities, attributes, and stories

Military training and learned combat skills

Before the scenarios, Hyunsung is an army first lieutenant. His initial profile registers Bayonet, Camouflage, and Patience, while Master of Steel's Starter Pack adds Weapon Training. Close-quarters practice, physical conditioning, formation discipline, and rapid response to tactical calls make him useful before his supernatural defense matures. He can organize a front line, handle weapons, carry injured or younger companions, and maintain position under attacks that panic civilians. These competencies complement Dokja's planning, Heewon's offense, Yoo Sangah's coordination, and Seolhwa's healing. (Chapters 4, 9, 21, and 395)

Training does not provide moral authority. His early reliance on rank and manuals leaves him hesitant when no recognized superior can decide, and military procedure cannot solve scenarios that demand the death of innocents. His development changes the purpose of the same habits: he learns to apply discipline to duties he has personally chosen and eventually leaves the army without discarding the responsibility or physical practice it taught him. Formal system-registered Skills fade with the Star Stream, but the corpus distinguishes that loss from ordinary learned habits and memories. (Chapters 4–35, 395, 465, 551)

Great Mountain Stigmata

Great Mountain Push is an early Stigma granted by Master of Steel. It magnifies sustained force and first lets Hyunsung open a jammed subway door. After his attribute evolves in Chungmuro, a destructive companion technique—translated as Great Mountain Crush, Smash, or Destruction—concentrates comparable power into blows capable of collapsing structures and terrain. With rising levels, physical statistics, sponsor synchronization, and Story support, Push grows from route opening to arresting a warship's advance; during the Final Wall rescue, it again opens subway doors at exceeded proficiency. (Chapters 9, 34–35, 395, and 537)

These techniques consume stamina and magic power and are not declarations of unlimited strength. After his first Great Mountain Crush, Hyunsung estimates that he can use it only twice more. Superior Status, stronger Stories, and authority-locked barriers can resist it: even his late Push and destructive strike cannot open the Final Door without the required fragments. Steel Transformation protects the body applying the force, while Dokja's tactics and the company's Stage Transformation turn it into a route-making tool rather than merely a large attack. The Stigmata remain active during the final rescue, but no source establishes full operation after the system dissolves. (Chapters 9, 34–35, 265, 395, 537, 551)

Steel Transformation

Steel Transformation is Master of Steel's signature Stigma and must be earned by inheriting and indirectly proving the sponsor's Story. Hyunsung unlocks its incomplete first stage during the Thought Infection crisis. It grows metal through his body, and the hardness is directly tied to his will and accumulated Stories. Early Armour provides a defensive coating; mature stages reinforce his whole body, regenerate damaged portions, spread protection to allies and equipment, and reshape him into a living sword. At level ten, Giant Soldier Pluto can wield him as the Steel Sword. In the final or fifth stage, his ordinary heart becomes pure steel, enabling the Greatest Shield state but placing him in a profound slumber. (Chapters 138–139, 331, 399, 435, 465, and 501)

The Stigma is powerful precisely because it has severe costs. Incomplete Armour melts under Hellfire and cooks him internally; stronger Status and Stories crack or strip the carapace; sustained protection transfers companions' injuries into his body. The fifth stage interrupts his agency, leaving him conscious only in fragments and vulnerable to being treated as a weapon. Oz resolves that crisis through memory and choice rather than medical repair. He later uses the final phase as himself, but Myth-grade heat can still melt planetary steel, and the company must share Probability and healing to keep him stable. Steel Transformation remains essential through the Final Wall rescue, after which system dissolution makes permanent supernatural access uncertain. (Chapters 138–156, 306–331, 395–465, 501, 537, 551)

Ruler of Steel and Last Steel

Ruler of Steel is the inherited Story authority that Hyunsung claims after recovering his memories in Oz. The succession is easy to misstate: the original Master of Steel passes his modifier and Story to the distinct 999th-turn Lee Hyunsung, and that inherited will then helps the main-world Hyunsung awaken. It does not merge the two Hyunsungs into one person. Main-world Hyunsung interprets the lineage for himself, using Ruler of Steel to operate the last phase of Steel Transformation as an active choice rather than remaining a passive Steelsword. (Chapters 460, 463–465, and 472)

Last Steel is the planetary defensive expression of that authority. In Oz, where the Master of Steel's Story has exceptional control, metal branches across the world and forms a barrier against an invading fleet. The feat is not his universal baseline: attacks against the metal reach Hyunsung directly, Myth-grade heat begins welding through it, and shared company Probability is needed against forces too large for him alone. He later applies the same Story at smaller scales to reinforce the company's vessel, equipment, and defensive formation. Its final confirmed use belongs to the scenario system; the epilogue does not establish that Ruler of Steel or Last Steel survives at full power after Stories fall silent. (Chapters 460–465, 492, 551)

Sword and Shield

Sword and Shield is the Story created through Hyunsung's repeated partnership with Jung Heewon. Its mechanics are cooperative rather than a free-standing attack: Hyunsung stops, absorbs, or redirects force while Heewon exploits the opening with concentrated swordsmanship, Judgment, and Hellfire. He can provide a platform, launch her toward a target, cover her blind spots, or become the Steelsword she wields. Voice Projection and years of shared combat improve their timing, while the named Story gives that practiced formation narrative weight. (Chapters 21, 395–396, 437, 488, and 501)

The partnership begins with their natural early front line and gains emotional depth when Hyunsung saves Heewon from Thought Infection. It becomes an explicit Story in the Great War, collapses when he sacrifices his heartbeat to protect her, adapts to his weapon form during Journey to the West, and returns as equal back-to-back fighting after Oz. Its limitation is the same danger embedded in both roles: Hyunsung can protect past recovery, and Heewon cannot preserve him by attacking harder. The named Story fades with the wider system, but their practiced coordination and relationship continue beyond its supernatural activation. (Chapters 21, 138–139, 395–437, 488, 501, 519–526)

Power progression

Relationships

• Kim Dokja: Dokja first replaces the failed chain of command with useful knowledge, and Hyunsung trusts him quickly. Their bond becomes deeper when trust gains the possibility of refusal: Hyunsung rejects the order to abandon Heewon, resists killing the Demon King of Salvation, and refuses to accept Dokja as a disposable cartridge. Dokja helps him bear Proof of Steel and later prioritizes recovering him from Oz. In return, Hyunsung joins every major attempt to retrieve the companion whose sacrificial plans repeatedly leave the company behind. (Chapters 9, 138, 187, 265, 459, 521, and 537)
• Jung Heewon: They develop from complementary frontliners into the company's Sword and Shield. Hyunsung's refusal to let Thought Infection kill her establishes their emotional closeness; ten subjective years in Kaizenix make them keepers of each other's identities, and his declaration of love recalls her when she has forgotten herself. His sacrifice to Barbatos wounds her deeply, but her vigil, decision to wield his conscious sword form, and demand for his soul preserve the person inside the weapon. After Oz they return to equal partnership and are shown together in the early post-scenario world. (Chapters 21, 138–139, 378, 395–396, 435, 465, and 519)
• Master of Steel and the 999th-turn Emperor of Steelsword: The original Master of Steel supplies Hyunsung's first Stigmata and recognizes his self-chosen proof. In Oz, the sponsor lineage passes to the separate 999th-turn Lee Hyunsung, whose inherited will helps the main-world incarnation recover his memories. Hyunsung completes the relationship by interpreting Ruler of Steel for himself rather than remaining confined within either a sponsor's legend or an alternate self's identity. (Chapters 9, 138, 265, 460, 463–465, and 472)
• Yoo Joonghyuk: Yoo Joonghyuk is an exacting commander and combat standard rather than Hyunsung's emotional center. Hyunsung follows his battlefield calls because they protect the group, continues training under the company's guidelines during Dokja's absence, and earns recognition as reinforcement capable of facing constellation-grade enemies. Their relationship demonstrates his mature form of obedience: competent direction can be accepted without surrendering personal judgment. (Chapters 265, 306, 465, and 537)
• Yoo Sangah, Shin Yoosung, Lee Gilyoung, and Lee Seolhwa: His protection extends across the company. He carries Gilyoung during the first escape, works under Sangah's rescue coordination, treats the children gently, and eventually spreads his steel over every companion. Seolhwa turns that defense into a sustainable group circuit by treating the wounds transferred to him. The company reciprocates by defending Oz while trusting him to recover his own heart. (Chapters 9, 265, 440, 464, 501, and 516)
• The army and civilian society: The army gives Hyunsung discipline, language, and an identity, but also reinforces his early dependence on manuals and authority. He returns to service after Dokja's Dark Castle disappearance because its structure helps him contain grief. His discharge in Oz is therefore development, not repudiation: he retains public responsibility while choosing its terms. After the scenarios, his work with Heewon against violent organizations continues the protective duty without restoring the old chain of command. (Chapters 4, 193, 464–465, 524, 530, and 542)

Items

• Giant Soldier Pluto: The Underworld's giant Story weapon becomes compatible with the company through its pilots and shared Probability. Hyunsung's level-ten Steel Transformation lets Pluto wield him as the Steel Sword against Heracles and later as a Hellfire-heated sacred torch. Pluto magnifies his reach, but it remains external equipment with its own operational and Probability limits rather than an innate Hyunsung ability.