Fourth installment of KO ONE: Continues the story where KO One Re-act left off: Lei Ting suddenly went missing after she and Xiu were lured back from the Iron Dimension by a fake message and attacked upon arrival by unknown forces. So how did Lei Ting (King) disappear? The KO one class no longer has its leader, so Gu Zhan and Zhi Ge, despite their brotherhood, fight. Who is the leader of the KO one class? The KO one class initially suspected the three Students from Little Apple High School of the kidnapping and fought against them. Later, they found King through another lead. But she was no longer the same King they knew and she seems to had amnesia. In the meantime, Duan Chang Ren also has gone missing. And Zhi Ge's father had a spy monitoring the class. A while later the three students from Xiao Ping Guo (Little Apple) High School - Zhi, Liu Chen, and Tai Yang transfers to Ba Le High School, the KO One class. Are they friends or enemy?