Yu Baek-Song

Yu Baek-Song is South Korea's sole White Tiger Divine Beast-type Soo-in and a senior state investigator. Her pursuit of the unknown Lycan brings her into conflict with Kim Sae-Jin, but their uneasy exchange of evidence becomes a lasting alliance that shapes the government's response to vampires, the operations of The Monster Guild, and her own rise from police command to national politics.

Biography

Hidden crafts and The Monster

Yu Baek-Song first appears publicly as Chief of the Special Investigation Division, announcing that the Mercenary Lycan is the prime suspect in a series of vampire killings. Her office has an exceptional record against Trait- and Mana-related crime, and her own bloodline gives the accusation unusual weight, but the conclusion is wrong: Lycan has been hunting the vampires responsible. When a new Dead Fissure expands a Monster field and the government needs his information, Baek-Song chooses operational necessity over institutional pride. She publicly retracts the accusation, apologizes on behalf of the SID, and requests his cooperation even though a White Tiger's inflexible ego makes the humiliation especially difficult for her. (Chapters 27 and 60–66)

The apology opens an indirect route to Sae-Jin, whom Baek-Song initially knows as the chairman associated with Lycan's crafts. He provides necklaces capable of alerting ordinary agents to nearby vampires; Baek-Song can already distinguish them by scent, but recognizes that her subordinates cannot. The SID purchases several copies and arrests thirty-nine vampires in a week, including suspects connected to the Fissure disaster. Her visits also reveal a serious limitation: as a pure-blooded first-generation Soo-in, her acute senses make Sae-Jin's wolf scent intensely intoxicating. Sae-Jin deliberately exploits that response to pressure her into investigating his parents, and the source treats her impaired judgment as the reason he obtains the commitment, not as evidence that she freely abandons professional caution. (Chapters 64 and 67–69)

Baek-Song nevertheless performs the investigation rather than merely yielding to Sae-Jin. She recovers suppressed records about his parents, explains the danger of reopening a case whose files were erased, and keeps working while vampire cases consume the SID's resources. At the same time, she uses an interrogated vampire and Lycan's intelligence to disclose the enemy's portal scheme and internal factions to the public. She initially rejects rumors that she will join The Monster, but her recurring private meetings, information exchanges, and willingness to coordinate state resources gradually turn Sae-Jin from a suspicious target into an indispensable ally. Her bluntness remains intact; what changes is where she places trust. (Chapters 68–75)

Vampire schemes and Jin Seh-Hahn

The limits of Baek-Song's office become explicit when she reaches sealed autopsy records but cannot access the deleted material above her clearance. Sae-Jin responds by promising to remove her superior and advance her, a proposal driven by his anger over his parents rather than her own request. Baek-Song is unsettled by his coercive intensity, yet the political operation succeeds: Kim Hahn-Seol is exposed, she is appointed Police Commissioner, and she later takes the post of Minister of Monster Affairs. The promotion frees her from obstructive superiors and gives her room to act, but it does not produce the expected file; she reports honestly that the decisive archive belongs to Eden and lies outside her authority. (Chapters 87–96)

Baek-Song then helps construct Sae-Jin's Jin Seh-Hahn identity so that he can enter Eden as a Knight candidate. She strengthens the false identity, helps him reason through the infiltration, monitors his progress toward the classified archive, and rejects the reckless idea of using Bathory as the convenient instrument of Jin's staged death. Kim Yu-Sohn participates in the same compartmentalized operation, preparing Jin's will and serving among the very small circle trusted with the Bathory intelligence. Baek-Song's role in that circle is both governmental and personal: she can mobilize official responses, yet she also insists that the hidden vampire base must remain under observation instead of being sacrificed to Sae-Jin's immediate anger. (Chapters 96, 108, and 116–118)

Her new authority deepens her partnership with The Monster rather than making it a simple extension of the state. She approves holding a captured vampire in the Mercenary Company's Mana-suppressing prison because the SID itself may contain compromised personnel, and she works with Sae-Jin's intelligence network on threats that ordinary bureaucracy cannot safely contain. This is the mature form of the relationship begun by her public apology: Sae-Jin supplies access, artifacts, and political leverage, while Baek-Song supplies legal authority, institutional reach, and the willingness to tell him when a plan is too dangerous. Her career rises through his sponsorship, but her value to the alliance rests on judgment rather than obedience. (Chapters 94–96, 105, 108, and 116)

Nosferatu alliance and the Bathory conflict

When The Monster considers a Nosferatu alliance against Bathory, Baek-Song accepts that the greater threat requires cooperation but refuses to treat the new partners as automatically trustworthy. She demands that the concealed vampires demonstrate sincerity and only yields when Sae-Jin personally vouches for them. Once committed, she joins the months of preparation, accepts a Mana Tattoo despite her fear of the needle, and attends the operation as one of the coalition's principal close-range fighters. Her position combines suspicion with decisiveness: she interrogates the alliance before the battle, then risks her life beside it after the group chooses a course. (Chapters 134–138)

In the first confrontation, Baek-Song transforms into the Giant White Tiger and attacks in concert with Rejen. Her body creates the opening and cover from which Rejen drives a blade into Bathory's heart; even after Bathory seizes her throat, Baek-Song continues striking until the Mana cannon is ready, then cancels the transformation and clears its line of fire. The trap fails to kill Bathory, and Rejen loses both arms in the counterattack. Baek-Song responds not by withdrawing from the failed coalition but by keeping the wounded Soo-in on her lap, pressing Hazeline to prepare a regenerative potion, and assuming responsibility for Rejen's care while the next plan takes shape. (Chapters 139–142)

The second assault again depends on coordinated roles rather than any single champion. Under Mana suppression, Baek-Song's White Tiger claws descend with the Knights' weapons, and she later steps forward with Joo Ji-Hyuk to shield Kim Yu-Rin from Bathory's physical counterattack. Bathory still outlasts the prepared attack, forcing Sae-Jin to teleport the team away, but Baek-Song survives and returns to the Guild's weekly planning. Her recovery alongside her pet Kaiser the Second, her continued intelligence work, and her concern for Rejen show how the operation enlarges her loyalties: the state officer who once publicly denied joining The Monster now acts as a member of its combat and domestic circle. (Chapters 145–146 and 152)

Exhibition, Fissure war, and aftermath

The conflict's later phase places Baek-Song inside The Monster's control room as well as its field teams. She and Kim Sun-Ho are assigned to track Bathory through the Guild's intelligence operatives, and she participates in the operation connected to the Exhibition and the el Las Fissure. Her direct practicality cuts through an overcomplicated infiltration proposal when she points out that Sae-Jin's teleportation sorcery can reach known coordinates. The ensuing rescue leaves several members critically wounded and Baek-Song battered but mobile; after extraction, she remains with the same coalition instead of retreating to the safer distance her political status could have afforded. (Chapters 152–156)

As the world crisis escalates, Baek-Song's old chain of command matters less than the relationships formed through The Monster. She attends its strategic meetings, accepts new members, accompanies the group even during rare attempts at rest, and receives a direct call from the President during the spreading Fissure emergency. At the final Guild gathering before Sae-Jin departs, her fear and affection are expressed through presence rather than a formal declaration: she remains among the people preparing for a war none of their institutions can reliably contain. The corpus does not give her an individual duel against the Dimensional Devourer, so her late-war contribution is established through intelligence, planning, prior Fissure operations, and continued readiness rather than an unsupported claim that she fought the final enemy personally. (Chapters 158, 165–168)

After the Fissures close and Traits vanish, Baek-Song survives the transition and redirects her ambition into elected government. One year later she is a specially elected member of the National Assembly filling a vacancy, already planning the campaign needed to retain the constituency and openly aiming for at least three terms. Her attention toward the Blue House suggests presidential ambition, bringing her arc from state employee to prospective national leader. She still attends The Monster's annual gathering and remains part of the Guild circle at Sae-Jung's later party, while her familiar quarrels with Hazeline show that official advancement has not displaced the blunt, affectionate personality she developed within the Guild. (Chapters 172–173)

Appearance and personality

Baek-Song has pure white hair, sharply shaped yet elegant eyes, determined lips, white tiger ears, and a long white tail. Her features are strikingly beautiful, but her petite height and youthful appearance make her look much younger than her age; she is around forty during the main story, which is still young by Divine Beast standards. Her ears and tail visibly betray moods that her formal expression tries to conceal, drooping under pressure, stiffening with suspicion, or moving freely when she relaxes. (Chapters 27, 64, 66–67, and 136)

She is proud, stubborn, and intensely sensitive to any reduction of a White Tiger to an ordinary tiger or cat. Anger can make her produce a deliberate animal-like roar, while embarrassment often produces growling, pouting, or an attempt to recover official dignity after an impulsive reaction. This volatility does not erase her seriousness: she apologizes when public safety requires it, confronts suspected deception, protects classified operations, and continues fighting after plans fail. Her pride is therefore both weakness and source of resolve. (Chapters 60, 66–69, 135, and 140)

Within trusted company, Baek-Song becomes openly childlike, food-motivated, and physically affectionate. She naps on Sae-Jin's lap, seeks cloth carrying his scent, fusses over Kaiser, and trades petty insults or physical scuffles with Hazeline. These comic behaviors coexist with protective tenderness, especially toward Rejen, and with considerable professional ambition. By the latest chapters, the same woman who once resisted a humiliating apology is comfortable asking Guild friends for campaign support while planning a long political future. (Chapters 132, 137–143, 158, and 172–173)

Traits and abilities

Baek-Song is a pure-blooded first-generation Soo-in of the White Tiger Divine Beast line, one of only a handful of first-generation Soo-ins remaining. Her bloodline is publicly regarded as stronger than that of a regular Highest Tier Knight, and it gives her physical power, heightened senses, animal transformation, and a longer scale of maturity than humans. The corpus presents these qualities as properties of her lineage rather than naming a separate personal Trait. (Chapters 27, 66–67, and 136)

Great White Tiger transformation

Baek-Song can assume a complete Great White Tiger form, greatly increasing her size and allowing her to fight with enormous front paws, claws, and physical resilience. Against Bathory, she rushes the target, withstands a beam to her flank, repeatedly strikes while being throttled, and deliberately returns to human form in time to escape an allied Mana cannon. In the later suppressed-Mana assault, her claws remain part of the coalition's heaviest simultaneous melee strike. These uses show both offensive force and the awareness to coordinate that force with allies. (Chapters 136, 139, and 145)

The full Divine Beast state lasts only for a short time; Baek-Song herself states that limitation before the raid. It also does not make her invulnerable. Bathory blocks a paw with one arm, seizes the transformed tiger by the throat, and remains functional after repeated blows, forcing Baek-Song to depend on Rejen, the Mana cannon, and the rest of the attack team. A Mana Tattoo is applied during the preparation period to strengthen her, but the corpus does not identify its specific design or quantify how much it improves the transformation. (Chapters 135–136 and 139)

Strength, agility, and endurance

Even in her humanlike form, Baek-Song possesses exceptional physical ability consistent with her Divine Beast bloodline. She can spring high into the air, withstand operations that severely injure other combatants, and interpose herself during Bathory's close-range counterattack. Her best documented combat performance nevertheless comes through transformation and teamwork, not a measured duel in ordinary form, so the source does not establish a precise human-form speed, lifting capacity, or Knight-equivalent rank beyond the public comparison to a regular Highest Tier Knight. (Chapters 27, 136, 145–146, and 156)

Her endurance is substantial but not unlimited. A sleep-inducing potion expected to hold an ordinary subject longer is estimated to keep her unconscious for less than five minutes, yet sensory overload, motion sickness, injury, and Bathory's superior physical power can all incapacitate or distress her. The story repeatedly distinguishes unusual toughness from immunity: she recovers quickly and returns to planning, but must still retreat, rest, and rely on allies when a stronger opponent or hostile environment exceeds her limits. (Chapters 135, 139, 144–146, and 156)

Heightened senses and tracking

As a first-generation Soo-in, Baek-Song has an exceptionally developed sense of smell. She can identify a vampire concealed among humans without Sae-Jin's detection necklace, a feat the narrative describes as nearly unique, and her sensory competence supports later intelligence and location-search assignments. This capability is most useful at close investigative range; the corpus does not specify a maximum detection distance, whether barriers can block it, or that scent alone can distinguish enthralled human collaborators from actual vampires. (Chapters 67, 73, and 152)

The same acuity creates exploitable vulnerabilities. Sae-Jin's Scent of the Wolf can overwhelm her concentration, especially in spaces saturated with it, and he repeatedly uses proximity or scented objects to influence her behavior. She counters this by meeting behind sealed reinforced glass or at her own home, demonstrating that distance and air isolation reduce the effect. Her keen senses also make rough travel especially nauseating. The vulnerability affects judgment and comfort rather than erasing agency permanently, but Sae-Jin's deliberate use of it during negotiations remains coercive. (Chapters 67–69, 87, 138, and 144)

Investigation and institutional command

Baek-Song's most consequential abilities are not supernatural. She directs an elite investigative bureau, evaluates evidence, conducts interrogations, manages sensitive records, makes public disclosures, and coordinates police, government, and private intelligence assets. She recovers files others tried to erase, recognizes compromised personnel as a custody risk, and keeps dangerous information compartmentalized. Her promotion expands her access and authority, but Eden's independent archive demonstrates a hard jurisdictional limit: even ministerial standing cannot retrieve records controlled by another institution. (Chapters 60, 68–69, 87, 94–96, 108, and 116)

Her latest demonstrated progression is political rather than martial. After the global disappearance of Traits, the corpus identifies her as an elected legislator with ambitions extending toward the presidency, but it does not explicitly say whether her Divine Beast transformation, senses, or other lineage abilities persist after that event. Her confirmed current capabilities are therefore organizational experience, public stature, coalition-building, and electoral ambition; any postwar claim that she retains her former combat powers would go beyond the supplied evidence. (Chapters 172–173)

Power progression

Relationships

• Kim Sae-Jin: Baek-Song begins by pursuing his Lycan identity, then apologizes and builds an exchange of artifacts, evidence, and state access with him. He exploits her sensory vulnerability and engineers her promotion for his own investigation, but she remains willing to oppose reckless choices. Their later bond is bluntly affectionate, and she stays within his Guild circle after his disappearance.
• Kim Yu-Sohn: Yu-Sohn works inside the same tightly restricted intelligence circle during the Jin Seh-Hahn and Bathory operations, preparing the false Knight's will and helping coordinate The Monster's information network. The corpus describes him in connection with Baek-Song's closest operational circle, but does not consistently establish a conventional superior-subordinate relationship between them.
• Rejen: Rejen fights from beneath Baek-Song's transformed body during the first Bathory trap, using the White Tiger's charge to land a critical strike. After Rejen loses her arms, Baek-Song treats the fellow Soo-in as a dependent, lets her rest on her lap, and presses for her regeneration treatment.
• Kaiser the Second: Kaiser is Baek-Song's black cat, given an extravagantly long formal name that she insists others use correctly. She fusses over him and brings him into the Guild's domestic spaces, although his conspicuous preference for Sae-Jin's scent repeatedly provokes her jealousy.

Items

No specific notable generated item is established for Yu Baek-Song in the supplied corpus.