In his past life, Cheol-soo rose from a mutilated palace servant to the feared Supreme Martial Eunuch, wielding absolute power in the imperial shadows at the cost of his bodily wholeness and humanity. Granted a miraculous regression fifty years into his youth, he is driven by a singular, unyielding ambition: to reclaim his physical manhood, revitalize the decaying Gongdong Sect, and forge an untainted martial legend. Coldly calculating, razor-sharp in psychological warfare, yet surprisingly protective of his new sect brethren, Cheol-soo treats every battle as an intricate political chessboard. Combat abilities and traits: Wields peak imperial palace secret arts, supreme internal energy manipulation, and ancient Gongdong sword forms inherited from Celestial Sword Lord Mugukja. Capable of generating pure Sword Energy (Geomgi), executing high-level light-body footwork, and manifesting the Supreme Martial Eunuch spiritual projection in high-tier energetic warfare.

The senior disciple of the Gongdong Sect who cross-dresses as a young man to survive the brutal realities of the Jianghu. Blessed with an extraordinary martial comprehension that allows her to mimic and master any technique after seeing it once, Jin-hwi initially struggled under the weight of her sect's impending ruin. Alongside Cheol-soo, she undergoes immense physical and spiritual growth, emerging as an indispensable pillar of Gongdong. Combat abilities and traits: Possessor of the awakened "Heavenly Martial Body." Wields the Demonic Blade and high-tier Gongdong sword styles with blinding speed, exceptional kinetic replication, and devastating burst Qi.

Renowned throughout the Central Plains as the "Sword Queen," Eun Seollan is the formidable leader of the female-only Hangsan Sect. Defined by an uncompromising sense of righteousness, icy composure, and peerless bladecraft, she serves as an arbiter of orthodox justice. Despite her initial skepticism of Cheol-soo's unorthodox methods, she recognizes his generational genius, personally guiding his sword energy training and standing beside him during the Blood Cult's subterranean invasion. Combat abilities and traits: Master of the Hangsan Supreme Sword Arts. Capable of projecting high-density icy Sword Energy, wide-area glacial blade domains, and advanced counter-offensive sword forms.

Feared as the "Thousand-Faced Demon King," Jeok Sa-wol is an elusive master of the Evil Sect who moves through the martial world under the guise of Yeo Ye-ryeong. Ruthless, mercurial, and profoundly cynical, she views all human interactions through the lens of deception and dominance. However, when Cheol-soo effortlessly dismantles her psychological illusions and sees through her disguised identity, her obsession turns into an anxious, conflicted emotional entanglement. Combat abilities and traits: Supreme Demonic Disguise Arts, psychological illusion techniques, high-speed lethal palm strikes, and insidious Yin Qi dispersion.

The proud, fiercely competitive youngest daughter of the Seomun Clan's patriarch. Raised under the expectations of elite swordsmanship, she possessed an arrogant worldview until challenging Lee Cheol-soo to a public wagered duel at Hwajeong County. Following an embarrassing defeat that shattered her outer garments, she was legally bound to serve Cheol-soo as his personal maidservant, sparking a volatile transition from humiliated noblewoman to begrudgingly loyal companion. Combat abilities and traits: Seomun Clan Noble Sword Arts, refined piercing Qi strikes, elite footwork, and aggressive duel-centric blade pressure.

A high-ranking operative within the Hao Sect and Sichuan’s most coveted courtesan. Wolhyang uses her intoxicating beauty and mastery over Charm Arts to extract high-value intelligence from warlords and sect masters. Fascinated by Cheol-soo’s total immunity to her seduction, she pivots from viewing him as a target to an invaluable business partner, backing Gongdong’s ascent with her vast information network and capital. Combat abilities and traits: Seduction and Mind-Bending Charm Arts, covert needle projection, hidden sleeve daggers, and clandestine intelligence gathering.

The spirited daughter of the Gongdong Innkeeper who was rescued from local underworld thugs by Cheol-soo. Inspired by his strength, she transitions from a bitter child into a formal disciple of the Gongdong Sect. Destined to become the future "Cold Sword Princess," she is devoted to Cheol-soo, balancing her intense training with notoriously catastrophic culinary attempts for her sect brothers. Combat abilities and traits: Nascent Frost Sword Qi, rapid physical conditioning, and foundational Gongdong sword katas.

The weary yet deeply principled Sect Master of the Gongdong Sect. Having shouldered years of economic starvation, territory loss, and disrespect from rival factions, he welcomes Cheol-soo into the fold without realizing his disciple's imperial past. He provides the moral and orthodox grounding that anchors Cheol-soo's aggressive expansion. Combat abilities and traits: Orthodox Gongdong Internal Arts, heavy defensive broadsword techniques, and seasoned tactical command.

The formidable patriarch of the Seomun Clan, universally revered as the "Great Sword King." A man of immense martial pride and political gravity, he commands absolute respect across the Central Plains. Though initially affronted by Cheol-soo's audacity, he respects raw martial conviction and honor above lineage politics. Combat abilities and traits: Peak Sword King Domain, crushing oppressive aura capable of paralyzing First-Rate warriors, and devastating clan sword arts.