Fourth installment of KO ONEز Three students from Xiao Ping Guo [Little Apple] High School – Zhi 執, Liu Chen 流塵, and Tai Yang 太陽 – joins the Ultimate Class. Are they friends or enemy?Female lead Lei Ting suddenly went missing. So how did Lei Ting disappear? The Ultimate Class no longer has its leader ;Wang Da Dong went missing. So Gu Zhan and Zhi Ge;despite their brotherhood fight. Who is the leader of the Ultimate Class?