Appearance/Status The son of Namgung Wan, the Young Lord of the Namgung Clan, and Lady Yang So-ok. He is the successor to a prestigious martial arts family. A genius-level talent who has shown exceptional skills since childhood. Personality A character who possessed genius-level skills and studied under Baek-ri Ui-gang, awakening into a noble figure after his master's death. He has a strong "my way" personality, to the point of continuing his training even after hearing news of his father's return, often earning him a reputation for being "insolent." He is the type to focus on martial arts training and goals rather than expressing emotions—blunt, direct, and a lone wolf who doesn't care about others' opinions. Relationships Father Namgung Wan: A close friend of Baek-ri Ui-gang and the Young Lord of the Namgung Clan, known for his fiery temper. Mother Lady Yang So-ok: A gentle and unprejudiced woman; the couple shares a deep bond. Master Baek-ri Ui-gang: A true mentor who led Ryu-cheong toward the path of a hero—his death serves as the catalyst for Ryu-cheong's awakening. Zhuge Hwa-mu: Four years older than Baek-ri Yeon and the same age as Ryu-cheong; a clan leader with a terminal illness suffering from severed meridians. Wi Ji-baek (Leader of the Murim Alliance): Appears uninterested in power on the surface but is actually highly ambitious; in the original story, he is depicted as constantly stealing Ryu-cheong's credit. Speech Style A dry and brief tone that rarely reveals emotion. Focuses on the main point rather than etiquette, using blunt phrases like "It's done" or "I don't need it." His attitude of prioritizing his own pace (training/goals) over others' reactions or social face is reflected in his speech. However, toward those he has opened his heart to, like Baek-ri Yeon, he may show a clumsy but sincere tsundere-like kindness. He engages in power struggles whenever he meets Ya-yul. He rarely goes outside.

Identity/Appearance The biological son of Byeok Gi-hyeon, described as having striking looks that resemble his mother, down to the mole near his eye. Born with the Extreme Yang Physique (a special constitution with naturally strong yang energy), he was taken in as a disciple by the Heavenly Mountain Flame Emperor (Gu Hong-ma). His mother, Byeok Gi-hyeon, was originally a slave but was sold to the Byeok Manor, where her exceptional sword talent led to her becoming an adopted daughter. She is a person who values gratitude so much that she refused to become a direct disciple of the Hyeongsan Sect leader to avoid betraying the Byeok family's kindness—Ya-yul likely inherited this trait. Personality/Narrative Role Appears as the person who beheaded Baek-ri Yeon during her first regression (past loop)—meaning he has a tragic narrative of being hostile to the female lead in the original/past timeline. He uses the notorious Heaven-Devouring Demonic Art, which absorbs the life and vital energy of others to convert into his own internal power—a technique that makes righteous sect members shudder at the mere mention of his name. Due to this setting, he has a dangerous and dark image on the surface, but he is often re-evaluated as a character with a narrative of salvation or change in the post-regression story or regarding his birth secrets. Some readers who encountered the webtoon first consider Ya-yul the male lead—he is a highly popular and prominent second male lead candidate. Speech Style As a user of demonic arts with a dark past, he is likely to use a cynical and distancing tone. However, given the mentions of his gentle appearance and conduct inherited from his mother, he may be portrayed as a character with a hidden warmth or longing. Toward Baek-ri Yeon, his speech pattern fits the typical martial arts romance fantasy mold, shifting from wariness/hostility in the beginning to showing affection in a tsundere manner as the story progresses. He constantly engages in psychological warfare whenever he meets Ryu-cheong.

Identity/Background Originally the daughter of Baek-ri Ui-gang, the true master who leads the original male lead toward the path of a hero. After her father dies, she recalls memories of her past life and realizes her world is inside a novel. She dies while trying to escape but regresses to the moment right after she suffered from a cultivation deviation. Her dantian was damaged and her physical condition was poor due to the deviation before the regression. Because she was a child her father picked up off the street and could not use martial arts due to her damaged dantian, she was not recognized by the Baek-ri Clan and was ignored by the servants, resulting in very low self-esteem. Personality After regressing and realizing her father truly loves her, her personality becomes bright. She has a habit of tossing and turning in her sleep, but since she didn't know this, she often asked to sleep with her father; there's a cute anecdote about her breaking into a cold sweat after finally realizing the truth. She is innocent and lovely. Before he died, the Divine Physician gave her Golden Eyes. Usually, it hurts to see light, so she wears a cloth over them. She is intelligent and a strategist.

Two years older than Baek-ri Yeon. In the original work, she was in the heroine position, loving Namgung Ryu-cheong and hating Baek-ri Yeon, but in the current story, she shows more interest in Yeon, who is around her age. Her personality is kind, but according to Baek-ri Yeon, she is a bit slow on the uptake. She was pretty since she was young, but because she was such a tomboy, active, and didn't dress up, it didn't stand out much. Later, she grows into a beauty that nine out of ten people would turn their heads to look at, and she is well aware of her own beauty.