Top Dog Kim Jian

A loser named Kim Jian transferred to Sujung High School... But actually, he’s the top dog of them all... and he's a girl!!
Jian’s parents, worried about their troublemaking daughter who’s been in fights with boys in the past, want to send her only to an all-girls school. But Jian wants to attend a co-ed school.
In the end, she’s allowed to go—on the condition that she'll disguise herself as a boy and keep it quiet...
But it’s already getting noisy!! -_-^