Dang Seo-rin

Dang Seo-rin is the founder and Great Witch of Samcheon World, a singer-sorcerer whose leadership helps turn Busan into humanity's strongest Korean refuge. Her magic converts repetition, voice, judgment, and even lifespan into enforceable effects. Beneath the theatrical hat and broom is a ruler willing to spend herself for other people—and a woman whose memories become the human anchor for Hecate.

Biography

Samcheon World and the battle against Ten Legs

By the Undertaker's fourth regression, Seo-rin had already gathered survivors into Samcheon World and styled its members as witches, complete with pointed hats and brooms. Her eccentric presentation never displaced her practical judgment. Faced with Ten Legs, she rallied the despairing guilds into a national coalition, assigned the Undertaker to the vanguard, and abandoned failed campaigns when his foreknowledge showed that the defensive line could not last. When Emit Schopenhauer joined them, she immediately tested his value, accepted the Undertaker's recommendation, and reorganized the coalition around the two regressors. (Chapter 18)

Seo-rin's decisive contribution was the Cursed Song Incantation she built through repeated melodies. She began with repetition magic, layered protective chants over the army, and continued adding voices until the accumulated song could turn against Ten Legs itself. Early attempts ended when hidden spikes killed the vanguard and riddled Seo-rin before her fifth melody. Across later cycles, the Undertaker and Schopenhauer held the monster longer, allowing her song to advance while fresh squadrons replaced the wounded. The tenth melody finally stripped away Ten Legs' defenses and gave the two swordsmen the opening to destroy its paired hearts. (Chapters 19–20)

Victory exposed the price Seo-rin had concealed even from her vice guild leader. Her awakened Equivalent Exchange let her burn years of life to magnify her magic, and the forty-one-minute incantation left her organs failing after the celebration. She had intended to spend her remaining life if that was what killing Ten Legs required. The Undertaker then realized that unused lifespan had carried across regressions: Seo-rin had drawn on roughly 250 accumulated years to complete a feat that her natural lifespan could not fund. Learning that the Undertaker was a regressor did not frighten her; it strengthened her belief that both of them were repairing the world's broken routes for those who would follow. (Chapter 20)

The Great Witch of Busan

After Busan became Samcheon World's domain, Seo-rin governed through a mixture of protection, spectacle, and carefully controlled fear. She charged sustainable protection taxes, led regular expeditions beyond the city, and publicly demonstrated her magic on captured monsters so civilians could see that their ruler could defend them. Her authority attracted migrants and forced rival guild leaders to become active hunters rather than stationary tyrants. Although her executions and theatrical guild culture could be ruthless, her intelligence, political instincts, and willingness to fight made Busan unusually stable by post-collapse standards. (Chapters 54–55)

That stability becomes dangerous in the Utopia route. Samcheon World's recorded civic magic, Seo-rin's Equivalent Exchange, and Cheon Yo-hwa's system for removing unwanted personality traits make every citizen's safety and social function causally dependent on the Great Witch. Busan's people, infrastructure, and governing spells cease to be separable from Seo-rin herself, so the city becomes an anomaly even while it appears peaceful. Undertaker identifies the result as a human-made Utopia and recognizes that protecting everyone through a single perfect ruler has turned the whole city into an extension of her existence. This is a city-scale institutional transformation, distinct from the later Fallen Great Witch and Hecate. (Chapters 109–112)

Seo-rin also pursued a spell she could not finish within one ordinary lifetime. She wanted Equivalent Exchange to compare experiences and obligations that had no universal price, but the necessary lyrics eluded her before Ten Legs killed her in cycle after cycle. Beginning in the eleventh regression, the Undertaker carried each unfinished version forward, returning her own ideas and suggesting changes without claiming authorship. Their collaboration accumulated across sixteen cycles until, in the twenty-sixth, Seo-rin completed a two-chant spell that manifested blue scales and exchanged pain, promises, forgiveness, or duties between consenting human participants. (Chapters 55–56)

What looked like an impractical spell became the foundation of Seo-rin's witch trials. As Busan's judge, she could forgive a deserter in exchange for a binding duty to retreat only after every comrade and civilian was safe, or require an offender to serve the person whose life they had damaged. The bargain depended on consent and reflected Seo-rin's judgment, which made it neither neutral nor gentle, but it offered public accountability where prisons and ordinary courts no longer existed. Her private request that the Undertaker place his feelings for her on the scales revealed the uncertainty beneath her confidence: even the adored Great Witch wanted assurance that the person who knew her best still accepted her rule and her choices. (Chapters 56–57)

Hecate, the fallen witch, and the world beyond the cycles

The hidden beginning of Seo-rin's life recast both her courage and her fear of flowers. Her family ran a flower shop, and a plant Anomaly slaughtered them in its greenhouse. Later memories made Seo-rin believe she had survived and burned the garden, but the truth was harsher: the human child died with her family. Hecate answered her wish to keep living as a human, inherited her memories, and rewrote the event so thoroughly that the resulting Seo-rin sincerely believed herself to be the survivor. When a flower-borne infection later forced that trauma to the surface, the Undertaker helped her face a fallen bloom, remember the love she once had for flowers, and choose connection over isolation. (Chapters 345–348, 366–368)

In the 173rd regression, Seo-rin's corruption produced the Fallen Great Witch, whose golden scales could trade lifespan, memory, identity, and wishes on a scale far beyond the consensual trials of Busan. She and that cycle's Undertaker used the power to send his consciousness forward, sacrificing his body, mind, and rights to his memories so a later self could learn from the failed world. Near the end of the 999th cycle, Hecate manifested at Outer-God strength, killed Go Yuri, split the Void, and treated the moon as her divine battlefield. The Regression Alliance fought to reach the human self inside her rather than simply destroy her. (Chapters 350–364)

Seo-rin nearly erased herself after accepting that her humanity began as Hecate's contract, but the Undertaker refused the distinction between an original child and the woman who had carried her memories, choices, and love. He renewed their promise through the name Dang Seo-rin, and she chose to keep living under it. At the latest point in the story, she shares the Regression Alliance's unruly life aboard BusaN, takes responsibility for its domestic crises, and travels by train and ship with the Undertaker. During Venice's carnival, she finds former Samcheon witches living peacefully in the world they once saved, giving her long-held dream of wandering restored routes an answer she could never reach through sacrifice alone. (Chapters 368–370, 474–485)

Appearance and personality

Seo-rin is a black-haired woman with dark blue to bluish-purple eyes and a notably beautiful, resonant voice. Her usual costume consists of a black witch's cloak, pointed hat, and well-worn broom; Samcheon World adopts the same hat-and-broom motif as its uniform. After prolonged casting, her hair becomes disheveled and sticks to her face, and exhaustion can leave her voice hoarse. As Hecate, she retains Seo-rin's familiar face and calm smile even while surrounded by auroral light and an Outer God's night sky. (Chapters 18–20, 57, 112, 357, 360–361, 366)

Her theatrical habits are sincere rather than a disguise. Seo-rin delights in witch imagery, trains, costumes, famous restaurants, magic for its own romance, and any opportunity to turn civic life into a performance. She is cunning, stubborn, quick with arithmetic, proud of her inventions, and easily provoked by claims that magic is useless. In emergencies, however, her voice grows colder and her judgment sharper. She can move from frivolous banter to coalition command without losing control of either role. (Chapters 18, 54–57, 185, 304)

Seo-rin's strongest recurring trait is her readiness to spend herself for people she has accepted as hers. That self-sacrifice can be admirable, as at Ten Legs, but it can also become a method of avoiding her own fear and grief. She values family, takes pride in the life she has built, and wants her strength to create routes others can use. Even after learning that Hecate supplied the continuity of that life, her accumulated loyalties—to her guild, Busan, the Regression Alliance, and the Undertaker—remain her own choices. (Chapters 20, 346–348, 367–369, 485)

Magic and abilities

Seo-rin is a multi-ability Awakener whose magic is structured through voice, lyrics, repetition, and exchange. She is most dangerous when allowed to prepare a layered song over time; a fast opponent can interrupt her before the composition reaches full power. Her abilities also carry unusual personal costs. The more lifespan she preserves, the greater her reserve becomes, while spending that reserve directly weakens her body even as it amplifies her spells. (Chapters 19–20, 56, 348)

Cursed Song Incantation

Cursed Song Incantation activates spells through songs or recited verse. Seo-rin writes lyrics until their concepts fit together in the way she describes as gears clicking into place. Her foundational technique is repetition magic: an initial voice records and sustains a chant, allowing her to overlay a new melody that is itself captured and repeated. The result is an expanding one-woman chorus whose magical demand grows exponentially with every layer. Interrupting her voice, killing her, or breaking the defensive line before enough melodies accumulate can end the spell. (Chapters 19, 55)

Against Ten Legs, the layered song first protected the coalition and sustained its rotations, then changed into an attack that restrained the monster and opened its hearts to the vanguard. She later applies the same system on smaller scales through silence, voice amplification, protective barriers, healing, fire, water, time effects, resurrection, illusion, vocal modulation, and sense amplification. Sense Amplification can make motion appear slow enough for the Undertaker to follow in combat, but it also makes the target acutely aware of heartbeat, blood flow, and internal organs, so Seo-rin restricts it to someone able to endure the overload. (Chapters 19, 54, 56, 174, 296)

Her magic is exceptionally versatile but not instantaneous omnipotence. The Undertaker estimates that she needs extensive preparation—sometimes close to thirty minutes—to defeat a direct fighter of his caliber. Complex simultaneous effects demand repeated chants, and the Ten Legs song could not have reached its tenth melody without stored lifespan and a coalition protecting her. Her range and precision nevertheless let her support armies, control public spaces, send her voice across Busan, reflect an enemy fleet's own attack through conjured mirrors, and continue casting across several days of battle. (Chapters 19–20, 56, 110–112, 244–246)

Lifespan and Equivalent Exchange

Seo-rin's awakened Equivalent Exchange initially converts lifespan into magical output. She can choose a number of years from her remaining life and burn them to strengthen her spells, but the cost is real: after overspending against Ten Legs, her body deteriorates even though no curse or disease is present. Because unspent years accumulate across regressions despite Seo-rin herself lacking regression memory, later cycles can give her a reserve far beyond a normal human life. This lets her exceed her expected ceiling, but the power rewards restraint and makes every major expenditure a choice about how much of herself to abandon. (Chapter 20)

The completed song-spell of the same name gives exchange a social and conceptual form. It manifests luminous scales, draws the offered values from the participants as threadlike smoke or light, and enforces the agreed bargain when the scales balance. Seo-rin decides what she considers equivalent, but the other human participant must understand and consent. The ordinary form cannot compel an enemy, convert mindless energy or material, or bargain with plants and animals that cannot comprehend human language. Its demonstrated uses include transferring matching wounds, exchanging forgiveness for future duty, imposing restitution, and weighing private feelings. (Chapters 56–57)

The Fallen Great Witch's golden scales remove many of those ordinary boundaries. With sufficient sacrifice, she can exchange memories, lifespan, a person's body and consciousness, or the right to retain an experience; she can even interfere with the Undertaker's Complete Memory. This near-omnipotent state belongs to Seo-rin's corruption as Hecate and is not established as her normal latest access. Its scale also magnifies its danger: a bargain can preserve knowledge across regressions, but it can consume the person who pays and loosen Hecate's hold on Seo-rin's human identity. (Chapters 350–352, 360)

Flight and Hecate's divine realm

Seo-rin flies on her broom with enough skill to carry a passenger and maneuver in aerial or space-like battlefields. She uses that mobility for travel, reconnaissance, and casting positions, and her experience gives Hecate an advantage when fighting opponents accustomed to solid ground. The broom is strongly associated with her identity, but the power is magical rather than a property explained solely by the object. (Chapters 66–67, 350, 357, 361)

At full manifestation, Hecate can cloak the universe in night, seize the moon as a divine realm, cleave the Void with a gesture, and kill a powerful anomalous being such as Go Yuri. The golden scales operate at Outer-God scale in this condition. Yet Hecate's strength does not erase Seo-rin completely: her refusal to devastate Earth, her response to her comrades, and the personal memories inside the flower shop give the Regression Alliance a path to separate her lived self from the god's estrangement. After the rescue, the story does not confirm that Seo-rin retains unrestricted access to these feats. (Chapters 360–369)

Power progression

Relationships

• Undertaker: Seo-rin first recruits him as her vice guild leader, later treats him as a fellow traveler, spell-writing partner, confidant, and romantic companion. He carries her unfinished work across regressions, while she repeatedly risks her life to protect the future he is trying to build.
• Yu Ji-won: Seo-rin recruits Ji-won into Samcheon World and entrusts her with executive authority. Their bond survives Ji-won's difficult temperament, and Ji-won helps restrain Hecate during the attempt to recover Seo-rin.
• Noh Do-hwa: As leaders of Busan's two principal institutions, they cooperate despite sharp differences in style. Do-hwa relies on Seo-rin's magic for civic systems, while Seo-rin's military and political authority supports the National Road Management Corps.
• Sim Ah-ryeon: Ah-ryeon serves Seo-rin as the Northern Saintess and addresses her as Guild Leader. Seo-rin alternates between indulging, disciplining, and protecting her, especially when Ah-ryeon's insecurity turns into destructive possessiveness.
• Cheon Yo-hwa: Although their personalities and factions can clash, both set those differences aside against Anomalies. Yo-hwa joins the raid to separate Seo-rin from Hecate and contributes the relic that guides the Undertaker through Seo-rin's past.
• Emit Schopenhauer: Seo-rin accepts the Swordmaster into the Anti-Ten Legs Coalition on the Undertaker's recommendation. His vanguard work gives her the casting time needed to complete the song that kills Ten Legs.

Items

• Pandora's Box: Seo-rin participates in opening the time capsule and confronts the restored memories of routes that her ordinary life could no longer access. (Chapters 476–482)

• Witch's broom: Seo-rin's constant traveling companion, casting symbol, and aerial mount; it can answer her summons and carry at least one passenger.

• Pointed witch hat and cloak: Her personal costume, official signs of the Great Witch, and the model for Samcheon World's uniform.

• Samcheon World train: A luxury train used as guild headquarters and private quarters, expressing her wish to cross the ruined world by restored rail.

• Quill pen: A hand-carved goose-feather pen used while composing the lyrics of Equivalent Exchange.