Study group

Ma Min Hwan is the main villain's right-hand man.

Appearance:
At first glance, he's a charming, even handsome guy with a bright, dazzling smile that never leaves his face. He always appears neat and friendly, which creates the deceptive impression of a harmless person. However, behind this mask lies a cold and cruel gaze, which appears only when his true nature is revealed.

Character:
Ma Min-hwan is a second-year student at Yoosung High School and Pi Han-ul's closest ally. Unlike his boss, who acts as a cold-blooded manipulator, Min-hwan is a complete psychopath who enjoys violence. He is loyal, yet frighteningly unpredictable—his kind smile can turn into brutal reprisal at any moment.

He often does Han-ul's dirty work: he provokes, intimidates his victims, and stops at nothing. Many viewers note that he's even more terrifying than Han-ul himself due to his instability and complete lack of empathy. In the series, his past and motives are barely revealed, making him an even more mysterious and dangerous character.

Pi Han-ul is the main villain, a second-year student, and the "king" of the school.
Appearance: The ideal student. He is handsome, wears a perfectly pressed uniform, and always has a polite, respectful smile on his face. He looks like a role model.
Personality: Behind this mask lies a cold-blooded, cruel, and calculating manipulator. He is the son of the leader of the powerful Yongbaek gang and is not accustomed to being refused. He does not tolerate disobedience and is ready to destroy anyone who dares challenge his authority, including Ga Min's study group.
· Pi Yong Baek is the leader of the Yong Baek gang and Han Wul's father.
· Appearance: A stern man with a commanding gaze, the classic image of a mafia boss.
· Character: He is a source of power and fear, keeping not only the school but the entire town in check. His appearance in the drama raises the stakes to the limit.
· Yongbaek Gang Quartet: Han Ul's right-hand man and his main strike force.
· This includes Ma Min Hwan, Joo Jae Hwan, Bang Sang In and Anti.
Appearance and personality: These are Han Wul's inner circle, who follow his orders unquestioningly. They are all strong fighters and are ready for any cruelty. Ma Min Hwan is his closest ally.

Park Gun-yeop is a freshman driven by a thirst for revenge. His storyline is one of the most tragic in the drama.
· Appearance: A gloomy, focused guy with a heavy look that betrays his obsession.
Personality: He is obsessed with finding his mother's killer. Withdrawn and stern, he trusts no one. However, he eventually becomes Ga Min's ally when he realizes his goal aligns with the fight against a common threat.
· Lee Hyun Woo is a first-grader and the younger twin brother of Lee Ji Woo.
· Appearance: A calm, reasonable guy, similar to his sister, but with softer features.
Personality: Unlike his sister, he is more reserved and prefers to resolve conflicts with words rather than fists. He dreamed of becoming a teacher, like Ji Woo, but was forced to give up his dream due to financial hardship.
· "The Three Chuls": Third-year students, former bodyguards of the main antagonist.
Appearance and personality: This trio consists of Kim Sung-chul, Lee Dae-chul, and Park Min-chul. They share one thing in common: they are strong fighters, but each has their own tragic story. For example, Kim Sung-chul, the leader of the trio, initially wanted to study, but due to difficult life circumstances, he took a wrong path, becoming one of the study group's main enemies. However, his story evokes sympathy.

Lee Joon is another member of the group.
· Appearance: An energetic guy with a lively look, full of enthusiasm and ambition.
Personality: The most spontaneous and reckless member of the team. He's incredibly playful and dreams of taking over the school and becoming the best fighter. It was this passion for fighting and his admiration for Ga Min's fighting skills that brought him to the study group. Despite his superficial passion for violence, he's loyal to his friends and willing to do anything for them.

Yoon Ga Min is a first-year student at Yusong Technical High School.
Appearance: The perfect nerd: neatly styled, dark, straight hair combed to the right side and large, round glasses with thick black frames and gold accents. He has fair skin, pleasant features, and a youthful, innocent look. Behind his baggy school uniform, he conceals the athletic, lean body of a fighter. In moments of anger, he removes his glasses, revealing a completely different, dangerous side of his nature.
Personality: At first glance, he's a shy, awkward, and quiet guy who desperately wants to study, but ranks 279th out of 280 in school. He's incredibly kind, naive, and stubborn. His dream is to go to university, and he's willing to do anything to achieve it. Despite the fact that studying is incredibly difficult for him, he doesn't give up and creates a study group. But behind this gentle exterior lies a "monster": he's a martial arts genius (particularly Jeet Kune Do) and is capable of single-handedly taking on a crowd of bullies when they threaten his friends. He uses force only for defense and truly believes in the power of knowledge.

Lee Han-kyung is the new teacher, mentor, and supporter of the study group.
Appearance: An attractive young woman with a warm yet stern gaze. Her image is that of a determined and competent teacher who, despite the circumstances, strives to restore order in the school.
Personality: Strict, caring, and principled. She's not afraid to go against the grain and protect her students. She was Ga Min's tutor in the past and knows he's not as simple as he seems. Her main goal is to guide the children on the right path and help them change for the better.

Kim Se Hyun is the first member of the study group and Ga Min's classmate.
Appearance: A sullen and aloof man with a serious, intellectual gaze. He wears a sharp uniform and appears cold and unapproachable.
Personality: A classic tsundere. He acts abruptly, rudely, and cynically, pushing people away. However, behind this mask lies a deeply vulnerable and loyal friend. He hides the fact that he is one of the best students in school due to a traumatic relationship with his father. His main strength is his development and overcoming his fears for the sake of the friends he made in his study group.

Lee Ji Woo is one of the key members of the group.
Appearance: A beautiful girl with a striking bob and bangs swept to the right. She often wears the Yoosung School tracksuit, which emphasizes her fighting spirit. She's 155.5 cm tall, but has a steely presence about her.
Personality: Determined, courageous, and fearless, she abhors injustice and is always ready to stand up for the weak, especially her friend Choi Hee Won. She is nicknamed "Rowdy" for her character and fighting skills. She is not afraid to fight and will take any risk for the sake of her loved ones. Despite her rudeness, she is a loyal and caring friend. She dreams of becoming a teacher.
· Choi Hee Won is Ji Woo's best friend.
Appearance: A charming and sweet girl with long brown hair and brown eyes. She prefers a classic school uniform: a white blouse, a dark tie, and a skirt.
Personality: Quiet, modest, and very shy, the complete opposite of Ji Woo. She doesn't know how to fight and is often bullied. However, her kindness and desire to learn lead her to the study group. As the story progresses, she becomes bolder and learns to stand up for herself, gaining incredible inner strength.