A Bias Girl

A Bias Girl (편견소녀) is a Korean manhwa written by Wie Sung-soo and illustrated by Kim Soo-min. It was serialized in Young Champ.

Plot
The antics of two high school girls: Kim Peongyon and Choi Boa. Kim aka "Bias Girl", is a foul-mouthed, overactive girl and idiot who weird and strange, bias ideas on people and things and Boa is smarter and saner of the two who plays the straight girl every time Kim does anything stupid.