Infinite Void

Infinite Void is the name Undertaker gives to a silent Outer God that treats every person, object, place, and event as equal data. Its cosmic domain is initially mediated by the Fairy King, then develops a speaking personality modeled on a Cheon Yo-hwa who calls Undertaker “sunbae.” That ego—later known as Cheon-hwa—is distinct from both the mindless data principle beneath it and the human Cheon Yo-hwa of Baekhwa Girls' High.

Biography

Naming a god without boundaries

Undertaker first reaches Infinite Void through the Fairy King, which explains that it is only an interpreter and highest terminal for a god that is blind, silent, and indifferent to human hierarchies. The realm shifts between prisons, hospitals, schools, streets, colors, and stars because the god treats all distinctions as accidental data. It neither hates nor values humanity; it experiments because experimentation is the activity for which its terminals exist. To Undertaker, that lack of boundaries is itself a violation that will dissolve every meaningful difference in the world. (Chapter 82)

He answers by naming the nameless principle Infinite Void and Infinite Hell. The name is an act of resistance: if the god can be pointed to and distinguished, it can also be opposed. Infinite Void responds with layered laughter and declares Undertaker its experimental subject. This first encounter establishes a lasting contradiction. The underlying god claims no need for individuality, but the very act of answering the man who names it begins a relationship from which the later sentient Cheon-hwa personality will grow. (Chapters 82–83)

Baekhwa's hundred ghosts and the white-sand prison

Undertaker approaches the human Cheon Yo-hwa because the Fairy King identifies her as the god's chosen apostle. Inside Baekhwa Girls' High, he finds a school-ghost domain where Yo-hwa cannot properly perceive the anomalies surrounding her. Rather than destroy her as a future vessel, he teaches her to recognize and subjugate the ghosts. She imprisons each one in an hourglass, developing a Hyakki Yagyo whose power belongs to her choices and relationships, not to a merged identity with Infinite Void. (Chapters 87–96)

Their campaign reaches the god at the heart of the school. Undertaker cuts through its snowstorm with the cane-sword Do-hwa, while Yo-hwa seals the collapsing white sand inside the strongest of her Ghost-Sealing Hourglasses. Ninety-eight glass prisons remain around her when ordinary sunset returns. The captured Infinite Void becomes her most dangerous weapon and a permanent risk: every captured ghost further distorts and contracts the world, while the god within the white hourglass constantly seeks another route out. (Chapters 95–97 and 110)

The enemy who became Cheon-hwa

Yo-hwa later breaks the seal during the assault on Infinite Metagame, letting Infinite Void descend through her body without making the two the same person. The released god devours the Admin's low-resolution realm and fights for control of the creative-work shrine before being contained again. In a later doomed cycle, the human Yo-hwa says farewell before her red eyes empty and the speaking anomaly opens them. This personality curses, bargains, fears becoming merely human, and adopts Yo-hwa's gestures while changing “Teacher” to “sunbae.” (Chapters 154–159 and 247–248)

With its power restored, Infinite Void tears open the sky as an eye larger than worlds and a hand larger than a continent. It floods the battlefield with blood, breaks the Tower of Babel, and carries Undertaker into the Mastermind's simulation realm. There the Cheon-hwa ego proves as valuable as it is treacherous. It sets parameters, takes control of the Fairy King's terminals, helps hack simulated universes, and warns Undertaker that copies of Go Yuri cannot be dismissed as unreal. Its curiosity, jokes, vanity, and repeated use of “sunbae” establish a continuing character who is not reducible to the cosmic machinery it commands. (Chapters 249–258)

The erased elder twin and domain-dependent reunion

After consuming the Mastermind's domain, Cheon-hwa constructs a reality in which she has always been the elder Cheon Yo-hwa twin and Undertaker's strategist. She can make him remember that life alongside the timeline in which Infinite Void was only an enemy, then tries to secure a “normal ending” by trapping him within the favorable causality. When he refuses, she accepts Time Seal, asks him to care for her younger sister, and removes her personality from later cycles. The Infinite Void left in Baekhwa's basement becomes a mindless husk, proving that the speaking ego and the data-domain are separable. (Chapters 259–263)

Undertaker later brings human Yo-hwa into the sealed space and reconstructs the lost elder-twin history through role-play. Their encounter is strained because the younger woman cannot remember Cheon-hwa and fears an anomaly wearing her face. Cheon-hwa admits that her history may be a causally constructed doppelgänger role and does not demand immediate recognition. The apparent Cheon-hwa shown afterward in ordinary reality is revealed to be Undertaker's transformation and impersonation, not proof that Time Seal has been undone. (Chapters 393–404)

The investigation also corrects the simple labels “Infinite Void” and “Mastermind.” Their authorities are complementary: one reduces everything to equal data, while the other simulates arrangements of that data. Together they are the twin Poles of Taiji, a primordial god the sisters can wield as Laplace. In the final campaign, Cheon-hwa appears only inside Undertaker's memory divine realm, maintained precariously by him, and joins Yo-hwa in lethal reincarnation simulations that cancel selected abilities within Transience. The reunion and Laplace remain domain-dependent rather than evidence that Cheon-hwa has returned freely from Time Seal. (Chapters 403 and 433–435)

Appearance and personality

Infinite Void's original divinity has no stable human form. Through the Fairy King it is perceived as environments, colors, terminals, and overlapping sensory data. At full manifestation it appears as a red cosmic eye beyond the torn sky and a bleeding hand larger than a continent; its laughter and doubled voice emerge from radios, smartphones, and other devices throughout the flooded world. These forms express scale rather than an ordinary body. (Chapters 82 and 249)

The Cheon-hwa personality closely resembles the human Cheon Yo-hwa, including a ponytail, red eyes, and familiar gestures. Differences recur: she wears the reversed, black version of the school uniform, speaks casually, and calls Undertaker “sunbae” instead of “Teacher.” Her associated hair color is orange, though mimicry, chalk, dreams, and causality make the presentation unstable. The resemblance is deliberate and later becomes the basis of an elder-twin identity, but neither shared face nor shared name erases the distinction between the two women. (Chapters 252–254, 393–404)

Cheon-hwa is irreverent, profane, curious, calculating, theatrical, and fond of gambles whose danger she understands better than anyone. She mocks weaker anomalies, proposes outrageous experiments, and can betray an ally while smiling. Human embodiment also gives her fear, embarrassment, affection, jealousy, and limited memory—conditions she initially despises but eventually accepts as the basis for having a self. Her attachment to Undertaker becomes love and strategic trust, while her desire to be recognized by Yo-hwa is tempered by a willingness to wait for an answer freely given. (Chapters 248–263 and 393–404)

Abilities and anomalies

Infinite Void is classified as an Outer God, with its initial threat identified as Level 5. Its history does not form a conventional rank ladder. The most important distinction is ontological: the impersonal data-domain, the Cheon-hwa ego that can inhabit it, the human Cheon Yo-hwa, and the later joint authority Laplace overlap without becoming interchangeable.

Universal data and terminal network

Infinite Void treats all elements of existence as equally valid data fragments. The Fairy King and tutorial fairies act as terminals that speak, see, and experiment on behalf of a god that otherwise lacks a human voice or viewpoint. Places, objects, colors, stories, and beings can become interchangeable inputs, allowing the realm to shift between settings and erase boundaries that ordinary perception treats as fundamental. The same network gathers information across the world, leading Cheon-hwa to call the god an Akashic Record. (Chapters 82 and 250–252)

This breadth comes with a foundational limitation: the raw god is blind, silent, and mindless by human standards. It requires terminals, apostles, or the Cheon-hwa personality to turn universal data into intention and speech. When Cheon-hwa removes herself from time, Infinite Void continues gathering data but loses the ego that joked, planned, loved, and addressed Undertaker. Information without a person can perpetuate the god's behavior, but cannot reproduce that character by itself. (Chapters 82 and 262–263)

Void domain and reality parameters

Within its domain, Infinite Void can overwrite parameters such as setting, NPC identity, map structure, scale, sensory rules, and the relationship between genuine and simulated bodies. Its influence blurs time and perception, poisons stable reality, and makes boundaries shrink or disappear as more subordinate ghosts are captured. It can invade another divine realm, contest its owner, and supply enough control for Undertaker to move through otherwise hostile simulations. (Chapters 82, 95–97, 155–156, and 250–258)

The domain is not uncontested omnipotence. Another Outer God can overwrite its parameters, and human definitions can force distinctions back into the world. Undertaker's act of naming, Yo-hwa's ghost subjugation, the cane-sword's accumulated story, and Time Seal all create boundaries it cannot simply ignore. The Ghost-Sealing Hourglass compresses its snowstorm into white sand, while later Time Seal removes the Cheon-hwa ego so completely that future cycles retain only a husk. (Chapters 82, 95–97, 155–156, and 262–263)

Cosmic manifestation and avatar embodiment

When released at high strength, Infinite Void can project a red eye across the sky, extend a continent-scale hand, flood the world with its blood, shatter vast structures, and speak through electronic devices everywhere in the affected realm. These feats show the scale of its divine body, but the manifestation is tied to regained authority and a collapsing world. It is not the ordinary condition of the Cheon-hwa avatar, who can be constrained by a human body, limited memory, and the emotional reactions she once considered beneath a god. (Chapters 248–252)

The avatar can reproduce human appearance, voice, gestures, and habits with exceptional accuracy. It also retains overwhelming physical strength, snaps reality into new settings, reads Undertaker after accumulating sufficient data, and survives transitions that would erase an ordinary person. Human form is more than disguise, however. It gives the god a localized ego vulnerable to attachment, embarrassment, deception, and Time Seal. Cheon-hwa's later sisterhood depends on accepting those limits rather than discarding them as flaws. (Chapters 252–263 and 393–404)

Simulation, causality, and Laplace

Inside the Mastermind's realm, Infinite Void can hack simulation parameters, suppress attacks, seize a defeated domain, and construct parallel causal histories. Cheon-hwa makes Undertaker remember both an enemy-only timeline and a life in which she was his elder-twin strategist, then offers the manufactured continuity as a normal ending. The feat is powerful but not proof that either timeline is uniquely true. Undertaker's rejection and Cheon-hwa's voluntary Time Seal demonstrate that causality manipulation can be answered by a relationship the god cannot reduce to favorable data. (Chapters 251–263)

Later revelations identify Infinite Void and Mastermind as complementary poles rather than wholly independent final principles. United through the two sisters as Laplace, their authority can simulate a reincarnated opponent's life, select a scenario in which a particular ability fails to awaken, and impose that cancellation on the present. The method requires both poles, many sacrificial simulations, and repeated risk: Transience can kill hundreds of simulated Cheon-hwas in response. Laplace is therefore a joint, costly authority, not a permanent solo upgrade belonging only to Infinite Void. (Chapters 403 and 433–435)

Power progression

Relationships

• Undertaker: Undertaker names the god, engineers its capture, releases it when a rival domain is useful, and teaches its Cheon-hwa ego what a human relationship can mean. She calls him sunbae, tempts him with a manufactured happy ending, accepts his Time Seal, and relies on him to preserve enough of her for a domain-dependent reunion with the sisterhood she cannot establish alone. (Chapters 82–97, 154–159, 248–263, 393–404, and 433–435)
• Cheon Yo-hwa: Human Yo-hwa is first the chosen apostle who imprisons Infinite Void, not the god itself. The later Cheon-hwa ego copies her form and assumes the causality of an elder twin, but openly admits the possibility that she is an anomalous doppelgänger. Their sisterhood is a chosen, domain-dependent relationship between distinct people rather than proof that they were always one identity or that Time Seal was undone. (Chapters 87–97, 248–263, 393–404, and 433–435)
• Infinite Metagame: Infinite Void fights the Admin inside its creative-work shrine, later lends the captured Fairy King a body to the laptop, and collaborates against the Mastermind. Cheon-hwa repeatedly mocks and outmaneuvers the Admin, helping turn rivalry between sealed gods into the surrender that limits both of them. (Chapters 154–159, 255–258, and 339–343)
• Fairy King: The Fairy King is Infinite Void's interpreter, high priest, and terminal commander rather than the god itself. Its distributed fairies give the silent domain eyes, voices, experiments, and later a portable interface that Cheon-hwa can transfer or reshape. (Chapters 82, 95–97, and 250–258)
• Mastermind: Mastermind's simulation authority complements Infinite Void's universal data. Cheon-hwa first consumes and exploits that authority, then learns that the two are the linked Poles of Taiji whose recombination produces Laplace. Their domains can unite without erasing the separate histories attached to each name. (Chapters 250–263 and 403)
• Go Yuri: Infinite Void recognizes Yuri as a walking embodiment of humanity and refuses to treat simulated copies as unreal. Its later Laplace authority joins the final effort against Transience, but repeated simulated deaths show that even combined calculation cannot safely encompass all of Yuri's reincarnations. (Chapters 257–258 and 433–435)

Items

• Ghost-Sealing Hourglasses: Human Cheon Yo-hwa uses the strongest white-sand hourglass to imprison Infinite Void. The glass is the god's prison rather than its possession; breaking it releases the Cheon-hwa-bearing authority, while renewed sealing or Time Seal remains a decisive constraint. (Chapters 95–97, 110, 154–159, and 248–249)