A member of the Korean Squad. He attacks by drawing four-character idioms with a brush. He is Areum's older brother.

Baekhyun's younger sister and a member of the Korean Squad. She attacks by drawing Hanja (Chinese characters) with a brush.

A member of the Korean Squad. He attacks by drawing the Hanja for 'Negation' with his brush.

A pink-haired girl with cat ears. A member of the Korean Squad and incredibly beautiful. She is still a beginner at writing Hanja with a brush.

Slightly resembles a cat and ends every sentence with '-chi'. A member of the Korean Squad who attacks by turning Hanja into full words with a brush.

Possesses the superpower of time travel and is the founder of the Korean Squad. Created the team to eliminate the monsters trying to erase language.

A member of the Math Abyss. A beautiful girl with white hair in charge of Division. Despite being a girl, others often mistake her for a boy.

A male penguin. While he has a penguin concept, he is actually human. He is in charge of Multiplication in the Math Abyss.

A hybrid of an arctic fox and a human, and very beautiful. She is in charge of Addition in the Math Abyss.

A girl with black and white heterochromia. She is in charge of Subtraction in the Math Abyss.