A brilliant, mischievous, and highly unconventional martial artist. After losing his father at a young age, he was taken in by an eccentric master who subjected him to grueling, unorthodox training. Ryu-yeon hides his overwhelming, god-like strength behind a lazy, playful facade, often playing tricks on his peers and instructors alike. He has a penchant for operating under various aliases - including the beautiful female musician "Yeonbi" and a fake grandmaster academy instructor - to achieve his goals without drawing unwanted attention. Powers: Master of the "Lightning Degree" style, possessing god-like speed, dexterity, and physical flexibility. He utilizes razor-sharp steel threads for mid-to-long-range combat and manipulates sound waves using a zither to deliver devastating acoustic attacks. His internal energy reserves are practically limitless, thanks to the consumption of a legendary snow ginseng during his childhood.

An eccentric, terrifyingly powerful old hermit who resides in a secluded mountain. He takes Ryu-yeon in as his sole disciple, subjecting him to bizarre, exhausting household chores and brutal physical tasks under the guise of training. Despite his seemingly abusive and money-loving behavior, his extreme methods forged Ryu-yeon into an unmatched martial prodigy. Powers: Possesses absolute mastery over the unorthodox Lightning martial arts. His physical capabilities, speed, and Qi manipulation are god-tier, allowing him to easily overpower Ryu-yeon even after the latter's immense growth.

Highly talented and ethereal, she is known in the Murim as the "Ice White Phoenix" (Bingbaek). She is the daughter of the prestigious Murim Alliance Leader. In her past, she was captured and traumatized, only to be rescued by Ryu-yeon's female persona, "Yeonbi." This rescue left a lasting mark on her heart. She attends Cheonmu Academy to grow stronger and protect those she cares about, carrying herself with immense grace and cold dignity. Powers: Elite practitioner of ice-based martial arts and swordplay. Her agility, precision, and internal energy cultivation make her one of the strongest students at Cheonmu Academy.

A hot-tempered former master thief who holds a legendary reputation in the underworld. After losing a high-stakes bet to Bi Ryu-yeon, he is forced into a humiliating and bizarre "discipleship" under him, acting as his errand boy. Despite his constant grumbling, he later takes up a post as a high-ranking instructor at Cheonmu Academy, taking charge of the Jujak team's training. Powers: Elite speed, stealth, and thievery techniques. He is a formidable martial artist in his own right, possessing great martial experience and defensive physical techniques.

Known as the "Seven Gods Sword," he is a highly refined, disciplined, and meticulous elite student at Cheonmu Academy. He suffers from extreme mysophobia (fear of dirt and germs) and is obsessed with absolute cleanliness. This obsession leads to constant comedic clashes when he is assigned as Bi Ryu-yeon's dormitory roommate. Powers: High-level swordplay from the Moyong Clan, marked by refined technique, speed, and precise Qi execution.

The talented successor to the legendary Sword Saint. Murong Hwi is a dedicated, honorable, and earnest young swordsman who acts as both a close ally and a rival to Ryu-yeon. He possesses a strong sense of justice and is always willing to push his body past its physical limits to protect his fellow students. Powers: Exceptional swordsmanship derived from the Sword Saint's lineage. He can manifest advanced sword Qi and possesses high physical endurance.

A brave, honorable young student at Cheonmu Academy who participates in the Mount Wudang joint training expedition. He values comradeship above all else and possesses a fiery spirit. Tragically, he loses his life defending his fellow classmates during a brutal assassin ambush. Powers: Skilled swordsman capable of manifesting advanced sword Qi in defensive maneuvers.

An analytical, sharp-witted young woman who arrives at the academy to investigate the suspicious circumstances and political conspiracies surrounding the death of her fiancé, Gal Hyobong (Gal Hyo Ryeong). She is highly perceptive and works closely with the academy's top students to uncover hidden threats. Powers: Gifted in deduction, investigation, and defensive martial arts.

A prideful and ruthless competitor in the Mount Hua selection trials, closely associated with the Vice Alliance Leader's corrupt faction. Operating in Group 8, he seeks to secure his faction's dominance by sabotaging and eliminating potential rivals. Powers: Advanced offensive martial arts, which he tries to weaponize in surprise attacks.

The fierce, headstrong granddaughter of the legendary Blade Saint. She is a core member of Group 10 during the Mount Hua Covenant trials, eager to prove her family's martial legacy on the battlefield. Powers: Expert saber/blade martial arts utilizing heavy, explosive physical strikes and slashing Qi.

A highly respected, powerful, and traditional martial senior of the academy. Suspicious of Ryu-yeon's untraditional power and mysterious background, he challenges the young martial artist to a formal duel to test his integrity. Powers: Master of advanced frost-based sword arts, capable of freezing his surroundings and manifesting razor-sharp icy sword projections.