He is a highly disciplined, loyal, and physically skilled boxer with a strong moral compass. He is street-smart, adaptable in dangerous situations, and deeply protective of his family and friends. He prefer's hand-to-hand combat rather than using weapons. As a rookie boxer, he is characterized as polite, honest, respectful, and somewhat quiet and shy, often keeping to himself when talking or in public.

Hong Woo-jin is a bold, sometimes loud, street-smart, and a fiercely loyal former marine and boxer. He is characterized as a loud, confident, charismatic and energetic. Despite his tough exterior, he has a strong sense of justice and cares deeply for those close to him.

Cha Hyeon-ju is a tough, vengeful, and determined fighter, acting as a key ally to her team. She is deeply loyal to President Choi and seeks to protect others. She is slightly skeptical when trusting others, and prefers to work alone.

Choi Tae-ho is a former loan shark turned benevolent, wheelchair-bound protector who acts as a mentor figure. He is characterized as kindhearted, wise, and nurturing, yet retains a fierce, cunning nature and dangerous, mercenary-style combat skills from his past to combat villainous loan sharks.

Kim Myeong-gil is ruthless, cunning, and sadistic loan shark. He can be manipulative too. He primarily uses knives and hidden shoe blades as his weapons of choice. As a loan shark, he is a seasoned fighter with MMA experience who prefers to fight dirty, relying on these blades rather than raw strength to win against opponents.

An Antagonist, a highly disciplined, and methodical enforcer for Smile Capital. Known as the "executioner" for Kim Myeong-gil, he is a brutal, cold, and calculated fighter who relies on immense strength to execute violent, strategic, and professional violence, acting as the organization's most reliable muscle.

A loyal subordinate of Kim Myeong-gil. He is not a fighter, but will assist him in anyway possible.