KO One Re-member

Fourth installment of KO ONE Three students from Xiao Ping Guo [Little Apple] High School - Zhi, Liu Chen, and Tai Yang- 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?