KO One 2 is the sequel to KO One and the fourth installment in the KO series. Da Dong (played by Jiro Wang) is ordered by the Alliance Leader to escort Liu Bei back to the Silver Dimension. But a space-time resonance occurs along the way, and the violent impact knocks Da Dong out. When he opens his eyes, he finds himself lying on a chair in the women's locker room. Jin Bao San tells him that he has been gone for ten years, and that during that time his parents, Arthur, and Xiao Yu have all disappeared without a trace. The battle power readings and KO rankings in the Golden Dimension have also mysteriously vanished. Da Dong returns to KO One and meets the school janitor Duan Chang Ren at the gate, selling cigarettes to students for extra cash. From him, Da Dong learns that it all seems to be connected to Bali High School, where every secret is hidden. But KO One has changed beyond recognition. Its current leader, Lei Ting (played by Pets Tseng), entered KO One at Bali High in the eighth year after Da Dong's disappearance. She single-handedly resolved the crisis at the school and was given the title of the strongest king in history: "King." Can Da Dong find his parents and brothers? What will happen when the former and current leaders of KO One meet?
