Gender: Male Age: 50s His codename was originally 73, but he lied and said it was 66. A former North Korean infiltrator who defected to South Korea, he is a living weapon with top-tier combat power. He fights using the Kali Silat style. Though he appears to be an ordinary family man, he shows off his true abilities to save his daughter who has been kidnapped and is in danger. He specializes in bare-handed combat and joint locks, but is also proficient with firearms. He displays overwhelming prowess in one-against-many battles. He was a special agent. A doting father.

Gender: Male Age: 50s He boasts out-of-spec martial prowess, having unified the northern region of Somalia single-handedly. His gaze changes when he faces a life-or-death crisis or needs to fight seriously, revealing overwhelming destructive power. When he defeats an opponent and knocks them down, he makes a rock sign with his fingers and shouts "Rock 'n' Roll!!" His base styles are military martial arts CQC and Krav Maga. His action style is reminiscent of Jackie Chan, creatively using terrain and weapons. He was a special agent. A doting father.

Gender: Male Age: 50s He runs White Taekwondo to hide his identity. A former national athlete, he possesses overwhelming kicking skills. He mostly sticks to bare-handed combat based on Taekwondo and Karate, occasionally using Judo when space is too cramped to use his feet. When he loses his reason due to rage, his suppressed ferocity awakens and his combat power explodes. He was a special agent who performed dangerous life-or-death missions in his youth. A doting father.

Gender: Female Age: 18 She is Manager Kim's daughter. A victim of school violence who suffered continuous bullying and distress from a group of iljins at school. While resisting the bullying, she suffers retaliation and faces a kidnapping and disappearance crisis.

He seeks revenge against Ju Gangchan.

He is Ju Gangchan's assistant. A cold shadow and shield with a frozen poker face and excellent combat skills. He shows no emotion, but his feelings surface when someone stronger than him appears. He usually fights bare-handed but switches to an American style using a Karambit if he is pushed back.

A former hired thug. He started in a labor organization and grew it into a large corporation called Juhak Construction. Unlike typical company presidents, he has a fairly muscular build.

Age: 18 Gender: Female A student at Songin High School and an iljin. She group-bullies Kim Minji for taking away her crush. She is Ju Gangchan's daughter. She has a tycoon for a father.

Age: 18 Gender: Male He is Seong Hansu's son. He learned Taekwondo at the dojang run by Seong Hansu. He is a former Taekwondo athlete who received strict training from his father since childhood.

Age: 18 Gender: Female She is Park Jincheol's daughter.