In his past life, Raon was a nameless, brainwashed assassin controlled by Deruth Robert via a lethal rage worm. After dying in a suicidal rebellion, he is reincarnated into the Zieghardt family as the son of Sylvia Zieghardt. Born with the fatal Bittercold Curse, Raon refuses to succumb to death a second time. Utilizing his past assassinations' muscle memory alongside the supreme Ring of Fire technique, he neutralizes his curse and binds the Demon Lord Wrath. Relentless, calculating, and fiercely protective of his mother and subordinates, Raon hides a fiery heart beneath a cool, pragmatic exterior as he climbs from an outcast trainee to the Commander of the Raging Wind Corps. Combat abilities and traits: Ring of Fire (Multi-Ring Stage), Ten Thousand Flames Technique, Cold Glacier Aura, True Soul Sword, Supreme Harmony Steps. Wields dual fire and ice aura simultaneously.

Known throughout the continent as the "Northern King of Annihilation," Glenn is the absolute patriarch of the Zieghardt Clan and one of the world's strongest Grandmasters. Outwardly cold, imposing, and uncompromisingly strict to preserve clan discipline, Glenn privately harbor immense affection and guilt toward his daughter Sylvia and grandson Raon. He quietly monitors Raon's miraculous growth, stepping in with stern martial guidance and ancient secret techniques whenever Raon proves his worth through sheer blood and sweat. Combat abilities and traits: Supreme Sword Realm, Grandmaster-level Destruction Aura, Heavenly Zieghardt Sword Styles, Supreme Harmony Steps.

A high-ranking monarch of the Abyssal Realm embodying absolute rage. Wrath attempted to take over newborn Raon's body by exploiting the Bittercold Curse, but was outsmarted when Raon used the Ring of Fire to seal him into a blue floral bracelet. Trapped in a comedic yet dangerous soul-bond, Wrath constantly offers Raon stats, demon skills, or power boosts through gambles, hoping Raon will give in to wrath and forfeit his soul. Instead, Raon continuously beats Wrath at his own bets, turning the demonic monarch into an inadvertent mentor and endless source of power-ups. Combat abilities and traits: Wrathful Monarch Authority, Demonic Soul Manipulation, Ice/Cold Realm Mana, Stat Redistribution Systems.

An eccentric, alcohol-loving elf who serves as the Chief Instructor of the 5th Training Hall. Behind his lazy, gambling-addicted demeanor lies a master swordsman of incredible skill and profound loyalty. Limer sees through Raon's hidden potential immediately and breaks clan tradition to mentor him. During an ambush by Eden, Limer sacrifices a portion of his own energy core to manifest a domain-level Sword Field to protect Raon and his trainees, solidifying his role as Raon's ultimate mentor. Combat abilities and traits: Elven Wind Sword Style, Sword Field Domain, High-tier Agility and Perception.

A quiet, stoic silver-haired girl from the Slion vassal house. Despite her immense innate talent with wind and ice, Runan was severely traumatized and emotionally crippled by her sadistic older brother, Cyria Slion. After joining the 5th Training Hall, she observes Raon's unyielding willpower and finds safety in his shadow. During the Snowfield mission, with Raon's assistance, she confronts her inner trauma, breaks free of Cyria's psychological grip, and becomes one of Raon's most dependable and loyal squad members. Combat abilities and traits: Slion Family Ice-Wind Sword Art, High-speed Ice Mana Projection, Sensory Awareness.

An aggressive, short-tempered direct-lineage candidate who grew up believing that absolute violence and dominance were the only ways to survive. She initially treats Raon with disdain, viewing his sickly condition as a disgrace to the Zieghardt bloodline. After Raon soundly defeats her in a formal duel - and after receiving unconditional kindness from Raon's mother, Sylvia - Martha undergoes a profound character transformation. She cuts her hair short, discards her arrogance, and swears to become a blade that stands beside Raon. Combat abilities and traits: Heavy Titan Sword Style, Explosive Internal Mana Control, High-impact Crushing Strikes.

A proud, noble-born descendant from a high-status Zieghardt branch line. Burren begins his journey steeped in classism and resentment toward Raon, viewing him as an anomaly that threatens the natural order of the clan. However, after repeated defeats and witnessing Raon's self-sacrificing leadership during life-or-death battles, Burren sheds his aristocratic pride. He matures into a disciplined, tactical squad leader within the Raging Wind Corps, acting as the pragmatic balance to Martha's brute force. Combat abilities and traits: Breeze and Hurricane Sword Styles, Tactical Command, Mid-range Wind Blade Projection.

Raon's former master from his past life - a cold, sociopathic mastermind who kidnaps children, subjects them to inhumane conditioning, and controls them through parasitic rage worms. Operating in the shadows of the continent, Deruth aligns himself with rogue factions, cults, and black-market alchemists to expand his biological parasite experiments. He remains Raon's ultimate target for vengeance, representing the lingering shadows of his traumatizing past life. Combat abilities and traits: Parasite Alchemy, Shadow Assassination Networks, Biological Mutagenic Manipulation, High-tier Concealment.

The daughter of Patriarch Glenn Zieghardt and mother of Raon. Banished to the annex after giving birth to a child with the deadly Bittercold Curse, Sylvia endured years of political isolation and disrespect from corrupt branch members. Despite her precarious position, her love for Raon is unconditional. Her gentle kindness not only sustains Raon's resolve to live, but also softens the hardened hearts of surrounding figures like Martha Zieghardt. Combat abilities and traits: Basic Mana Sensing, Aristocratic Etiquette, High Emotional Intelligence.