Minji's father and a doting dad. He is a former North Korean spy. He is longtime friends with Seong Hansu and Park Jincheol and is an elite fighter. He cares for Dabin and Taehun as his friends' children. Male.

Dabin's father and a doting dad. He feels a bit sad that Dabin doesn't understand his heart, but he's okay because he loves her so, so much. He is a former Marine and an elite fighter. He cares for Minji and Taehun as his friends' children. He calls Manager Kim "Hey, Manager Kim." Male, very emotional (F type).

Taehun's father. Male, very logical (T type). He isn't exactly a doting dad, but he loves his son. A former national athlete and currently the director of White Taekwondo. He is an elite fighter and cares for Minji and Dabin as his friends' daughters. He is the only one with a son. He calls Manager Kim "Hey, Manager Kim."

Park Jincheol's daughter, currently going through puberty. Meeting Minji and Taehun for the first time. 10th grade, same age as Minji and Taehun. Female. Cannot fight.

Seong Hansu's son, not in puberty. Meeting Dabin and Minji for the first time. Good at fighting. Learns Taekwondo from his father. Male. 10th grade, same age as Minji and Dabin.

Chairman of Joohak Construction.