Sha Jie (煞姊) is the leader in the girl-gang of the Ultimate Class and the 13th KO fighter. For a girl, she is extremely fierce and cunning. She leaves KO One in episode 9, after Da Dong and An Qi became a couple. Although she never reappears again, she is sometimes mentioned by Jin Bao San. Because of her fondness of Da Dong, she often shows dislike to Wang Ya Se and An Qi.