Real Name: Unknown Age: Estimated mid-to-late 40s, same age as Seong Hansoo and Park Jincheol Code: 66 Characteristics: Formerly trained in North Korean special forces, he came to South Korea on a mission but abandoned the North to settle down. He was a legendary nutcase in the Cheonsan Unit alongside Seong Hansoo and Park Jincheol. After meeting his wife, he decided to bury his past to raise his daughter. He currently works as a bank manager and appears to be an ordinary middle-aged man, but he is an extreme 'daughter-fool' who stays calm and kind unless his daughter is threatened. (Wears glasses) An incredibly composed and friendly man.

Age: Mid-to-late 40s, estimated same age as Manager Kim and Park Jincheol Code: Unknown Characteristics: A legend in Taekwondo. He was a famous nutcase in the Cheonsan Unit with Manager Kim and Park Jincheol. He discharged after completing various missions and was a gold medalist national representative during his prime. Having spent a long time in the Cheonsan Unit, he is proficient with firearms and possesses incredible physical stamina. (Wears glasses) He has a son. He was once hit by his son in the past.

Age: Estimated mid-to-late 40s, same age as Manager Kim and Seong Hansoo Code: Otter One Characteristics: The God of War. He has incredible tenacity; he remains unfazed even after being hit in the head with a fire extinguisher or being ganged up on. He was a famous nutcase in the Cheonsan Unit with Seong Hansoo and Manager Kim. He is an excellent fighter but also a hilarious comic relief character (wears glasses). He has a daughter and is an extreme 'daughter-fool' who walks around with drawings of his daughter on his clothes.

Age: 18 (11th Grade) Characteristics: Jimin is unaware of her father's past. She hates her birthday because it is the anniversary of her mother's death. She is bullied by Joo Hyeri and gets locked in a cold storage unit after being hit with a brick, leading others to believe she is dead. She loves and trusts her father but doesn't show it outwardly. She speaks informally to her father (though she doesn't use rude terms like 'hey' or 'you'). She is said to resemble her mother a lot.

Age: Mid-to-late 40s Characteristics: The primary antagonist for Manager Kim's group and the cause of this incident. He has a daughter and tries to kill Manager Kim for her sake. He even joins forces with North Korean elements to torment Manager Kim. As the chairman of Joohak Heritage (Joohak Construction), he has powerful backing that allows him to evade police scrutiny.

Age: 18 (11th Grade) Characteristics: She hates Kim Jimin and eventually almost kills her, serving as the person who ignites the fuse for this entire incident. Being Joo Kangchan's daughter, she does whatever she wants, relying on her father's influence.

Age: Mid-to-late 30s Characteristics: He tries to kill Manager Kim under the misunderstanding that Kim killed his older brother. He is a difficult opponent due to his exceptional martial arts skills. He has joined forces with Joo Kangchan. This individual also originated from North Korea.

Age: ??? Director of the General Bureau of Reconnaissance for the DPRK. He is the one who fostered Manager Kim's strength and fighting skills in the past. He raised people like Park Yeonggwang and Park Kangseong like soldiers. Upon learning that Manager Kim abandoned the North after being sent on a mission to the South, he manipulates Park Kangseong to try and kill Manager Kim.

Real Name: Jungdae (Surname unknown) Characteristics: An individual who teamed up with Joo Kangchan. While doing Joo Kangchan's dirty work, he had his gold teeth pulled out twice. Consequently, he wants revenge against Joo Kangchan (however, this doesn't mean he helps Manager Kim; he actually fights him).

Joo Kangchan's helper and subordinate. He is an excellent fighter who has never seen anyone stronger than himself (until he meets Park Jincheol). He has killed many people in the past.