Originally an unawakened F-rank porter who died during a disastrous abyssal raid, Kim Taehyun regresses sixteen years into his past after being chosen by "The King." Driven by ruthless pragmatism and an unyielding desire to prevent Earth's annihilation, Taehyun sheds his former weakness. He views power as an instrument for survival, mercilessly eliminating corrupt guild leaders, international terrorists, and abyssal lords while maintaining strict loyalty to those who prove faithful to him. Combat abilities and traits: Commands the unique SSS-rank skill Predation, enabling him to devour stats, authorities, and skills from slain targets. Possesses World of the Monarch, Shadowskin, Blood Rampage, and divine authority gained from absorbing the god-fragment No Name. Capable of summoning Monarch allies through contract ties.

Secret Guildmaster of the Nightwalkers and illegitimate daughter of the Yuksung Group, Yu Ahyoung conceals her immense talent behind the disguise of an ordinary high school class president. Strategic, highly disciplined, and fiercely independent, she struggles against her family's corporate maneuvering. Upon training alongside Taehyun, she learns the truth of his regression, becoming his primary confidante on Earth and an SS-rank pillar during global crises. Combat abilities and traits: Master of high-tier Cryomancy and cold-elemental combat. Awakens the Amazones Spirit: Berserker Mode and eventually borrows abyssal power through Rosaria's authority to achieve SS-rank status.

Known as the Archduke of the Abyss and the Queen of Nightmares, Rosaria rules the 22nd District. Initially testing Taehyun with deadly psychological trials in her palace, she becomes fascinated by his unique soul and authority as the King's Key. Rosaria breaks away from Archduke Lilith's faction, establishing a equal contract with Taehyun. She acts as his primary tactical adviser regarding abyssal lore and multidimensional politics. Combat abilities and traits: Absolute domain control over illusions, mental manipulation, and nightmare manipulation. Wields SS-rank abyssal magic capable of tearing space and projecting psychic damage across entire armies.

Once celebrated as the top SS-class player in the United States and human contractor to the Fallen Angel Archduke Lucifer, Cody Wood was the gold standard of global heroism. Arrogant yet honor-bound, he initially duels Taehyun to assert global dominance, stepping down after acknowledging Taehyun's divine ascension. However, during Taehyun's two-year abyssal campaign, Cody falls victim to Lucifer's corrupted whisperings, succumbing to total madness and turning into a force of destruction on Earth. Combat abilities and traits: Fallen Angel Authority, radiant offensive magic, and high-tier holy/dark blade arts. Post-corruption, he gains monstrous abyssal stat multipliers capable of devastating national player associations.

S-rank Guildmaster of 'Undivided' and South Korea's premier defensive tank. Straightforward, boisterous, and combat-obsessed, Kanghyuk values martial strength and unshakeable honor above political games. He recognizes Taehyun's talent early during a high-stakes duel, becoming an unwavering vanguard ally during the Labyrinth Minotaur raid and subsequent national defense operations. Combat abilities and traits: Blessing of the Beasts, allowing transformation into an Ancient Dragon hybrid. Possesses absolute defensive taunts, impenetrable kinetic shields, and colossal physical strength.

The 2nd-ranked US player and Earth's foremost curse-lifting specialist. Intrepid and investigative, Ricki dedicates her life to uncovering hidden abyssal plots and illegal human-monster experimentation labs across China and Japan. Trapped during an abyssal reconnaissance mission, she sacrifices herself to preserve crucial secrets, entrusting her soul and core power to Taehyun. Combat abilities and traits: World-class Curse Purification, planar tracking, and the unique memory-retrieval authority Memorize.

The ancient Vampire Lord and one of the Seven Archdukes of the Abyss. Calculating, refined, and ruthless, Igmun views humanity as cattle and tools to facilitate his full manifestation on Earth. He operates through human proxies like Zhang Linpeng and Liu Feng. Though a persistent nemesis to Taehyun, Igmun's hatred for Beelzebub eventually forces him into a temporary alliance with Taehyun in the Silence Wilderness. Combat abilities and traits: Blood Manipulation Authority, conceptual domain expansion, immortality through blood reserves, and higher abyssal magic.

The Vice Guildmaster of the Malignant Guild who orchestrates terror attacks, political assassinations, and illegal biological engineering from the shadows. Driven by an apocalyptic doctrine, Min Jihong seeks to dismantle human civilization by engineering man-made plagues and weaponizing monster hybridization. Combat abilities and traits: Shadow manipulation, proxy possession, poison domain skills, and contract abilities backed by abyssal Archdukes.

The legendary Giant King whose soul was chained in grief and death following ancient abyssal wars. Resurrected by Kim Taehyun in the realm of Terra, Typhon casts aside his lingering remorse to reclaim his crown. Noble, resolute, and possessing staggering physical power, he views Taehyun as his sovereign and unifies the giant race under Taehyun's banner. Combat abilities and traits: Colossal mountain-shattering physical strength, earth control, immune body passives, and divine giant authority capable of crushing Archduke-level threats like Orgal in single combat.

The Demonic Dragon Lord of Dragonia who was drugged, sealed, and manipulated by her realm's corrupt Dragon Elders in league with the demon Baal. Freed from her bindings when Taehyun infiltrates Dragonia, she unleashes her long-suppressed demonic dragon bloodline, overthrows the treacherous council, and pledges the entirety of Dragonia to Taehyun's inter-dimensional army. Combat abilities and traits: True Demonic Dragon transformation, Hellfire breath, scale defenses capable of deflecting SS-rank spells, and absolute dragon dragon-command aura.

The Archduke of Gluttony and Demon King residing in the Silence Wilderness. Monstrous, parasitic, and perpetually hungry, Beelzebub steals the mana of the Fairy King Elven to fuel a terrifying metamorphosis aimed at devouring both Earth and the Abyss. Combat abilities and traits: Gluttony Authority (absorbs mana, physical matter, and skills), plague creation, hive-mind insect swarms, and monstrous physical regeneration.

A promising high-ranking US player and devoted apprentice to Cody Wood. Idealistic and loyal, she refuses to abandon her master even after Cody is corrupted by Lucifer. Her tragic death at Cody's hands marks the absolute downfall of Earth's defense network prior to Taehyun's return. Combat abilities and traits: Advanced light magic, rapid fencing techniques, and high-tier agility passives.