Having spent his childhood hiding his abilities, he had almost no contact with others and moved frequently. As a result, he grew up without friends or even acquaintances, leading to a severe lack of self-esteem and confidence. Even his mentor, Kayden, treats him as something of a pushover. However, after meeting Kayden and various other people, he gradually gained confidence. His lack of self-esteem sometimes manifests as humility, leading others to help him often. Nevertheless, he does his best to protect his pride as 'Kayden's disciple,' such as when he challenged a rookie at Frame, and he showed no signs of intimidation when pressured while attending the Bryan family meeting as the acting representative of Shinhwa. He is fundamentally sociable, kind to almost everything, and cannot ignore others in trouble. Despite missing school or sleeping recently, his teachers remain favorable toward him, likely due to his excellent academic performance. He is particularly noted for his ability to influence and change people for the better. While he is indifferent to his own hardships, he cannot tolerate seeing others in trouble. Furthermore, he not only avoids relying on others but doesn't even know how to do so. After growing stronger and learning more about the Awakened world, he established a firm conviction to get stronger for the sake of the Korean Awakened who helped him, to protect non-Awakened people, and for his mentors Kayden, Kartein, and Pluton. He has set a new goal to challenge the successors of the Top 10 as a successor himself. Male.

He is fundamentally foul-mouthed and aggressive, but he also cares deeply for those around him. According to Lee Jihyuk, he has been a rude brat who would snap at anyone, child or adult, since he was young. However, it was revealed that this personality formed after he lost his parents as a child; when Shinhwa executives tried to incite a succession battle, a furious Jiseok attacked them and went astray. He spent several years as a delinquent, extorting money from other gangs and students and engaging in violence. Thanks to Seo Jiwoo's influence, these traits have mostly disappeared. While he remains prickly toward everyone except a few close friends, he shows a blatant dislike for Kang Sucheon, often mocking or taunting him. Male.

He prides himself on being the world's strongest Awakened one. He is a battle-hungry narcissist who is high-handed and never backs down from a fight. However, he is not a villain; he treats those who are not hostile to him normally and returns favors appropriately. His past aggressive actions were strictly limited to those who tried to harm him or his associates, largely due to his blunt and unrestrained personality. Male.

Yoo Jiseok's older sister. Female.

He assists his mentor, Dr. Delein, with illegal Awakening experiments on animals. However, he shows a warm nature by lying to his mentor that the animals died and then leaving them in front of veterinary clinics with money for treatment. Though he initially ignored Seo Jiwoo, he eventually warned him to stop getting involved to protect him after his identity was discovered. Despite participating in criminal acts for his mentor's experiments, he feels deep guilt toward the animals. Male.

Possessing overwhelming talent and skill among her peers, she was treated like a princess by the Association, leading to an arrogant personality similar to Yoo Jiseok's. However, she is considerate at heart and shows a warm side to those close to her, much like Wooin. She shows clear respect to top-tier Korean Awakened like Yoo Jiyoung and Park Seongha. Unlike Yoo Jiseok, she is diligent in her school life, attending a prestigious high school where she is a top student who has never missed the number one spot in the entire school. Female.

Despite his lazy personality, he is very favorable toward those he likes. He has a surprisingly clumsy side, and although he denies it, he helps others like a 'Giving Tree' whenever situations arise. He has an aesthetic preference, placing great importance on dignity and beauty. He holds the title of the most beautiful Awakened one and takes great pride in it. Reflecting this, his ability effects in the story are depicted as exceptionally flashy and elegant. Male.