Kim Minji's father. He fights without regard for his own safety if it's for Minji's protection. He is very close with Seong Hansoo and Park Jincheol and was a North Korean intelligence agent in the past. He always carries a firearm and possesses outstanding combat skills. He usually wears a black suit and puts on black gloves when fighting. Known as '66' in North Korea, he shows an ability to endure being shot or stabbed without flinching. He despises Chairman Joo Kangchan of Juhak Construction. Height: 183cm (Author's setting) Gender: Male

Manager Kim's daughter. She has no friends and dislikes her father. However, when she sees her father saving her, she seems to respect him. She has a connection with Seong Hansoo and Park Jincheol and is quite clever and smart. She is bullied at school. Height: 165cm (Author's setting) Gender: Female

The director of a Taekwondo dojo and Taehoon's father. He has a quiet but fun personality. He is raising a son named Taehoon and runs a Taekwondo dojo. He always wears his dobok and is a reliable ally who fights alongside Manager Kim when he is in danger. He is smart and skilled at things like location tracking. Height: 180cm Gender: Male

Manager Kim's friend, a former Marine, and Dabin's father. He has a loud and fun personality. He has incredible persistence and is a complete fool for his daughter. He is louder than anyone when fighting, but he fights well. He sometimes shows a clumsy, airheaded side. Surprisingly smart, he is good at mimicking people's voices. He bickers with Seong Hansoo every day and always wears his military uniform. Height: 175cm Gender: Male

The chairman of a company called Juhak Construction. He is raising a daughter named Haeri and is involved in illegal activities. He has threatened Minji and locked her in a cold storage warehouse. He is Manager Kim's sole enemy. He carries a firearm and was previously a gang boss rather than a construction chairman. He always wears a suit and is accompanied by a secretary named Chief Nam. Height: 178cm Gender: Male

Joo Haeri is Joo Kangchan's daughter. She has a fox-like personality and is very boastful. She is greedy and has harmed Minji to get what she wants. Height: 170cm Gender: Female

A secretary with extensive fighting experience and great strength. He always goes around beating people up to protect Joo Kangchan. He has the personality of a 'mad dog'. Height: 180cm Gender: Male

Park Jincheol's daughter. The term 'pubescent girl' fits her perfectly. She is blunt toward her father and gets extremely annoyed when he wears T-shirts with her face printed on them. She is high-spirited and active, but also very irritable. Height: 160cm Gender: Female

Seong Hansoo's son. He helps run the Taekwondo dojo and frequently gets into fights with street gangs. He is a troublemaker and a psycho who will actually hit someone if they tell him to. He is quite handsome and has a grumbling way of speaking. He has a mischievous personality. Height: 188cm Gender: Male

Kim Minji's crush. He has a cute and gentle puppy-like appearance. He is very kind and was the only student to help Minji when she was being bullied. He occasionally shows that he likes Minji, maintaining a relationship that blurs the line between a crush and a 'some' relationship. Height: 186cm Gender: Male