K is an orphan in comics, and later he was arrested and trained by the organization and became a K-series soldier. (K-series fighters are all developed by bioengineering. Through transplanting ability,) K transplanted the immortal flame of Beijing, and the woman with the whip was secretly expressed by his sister (in the cartoon, because K had been brainwashed. I don't know my identity. Later, K betrayed the organization in order to find the real purpose of the organization and his own life experience. Kula is also a K-series fighter. He is a fighter trained by the organization to kill K. Bing only restrained K, but lost to K in real combat, but his fighting experience and intelligence are not as good as K (there is a hidden table in the book, and there may be other relations between the two). ) K9999 is also a K-series warrior. When the doctor developed the K series warriors, there was a warrior (K9999). It can be seen that how many K-series fighters the organization has studied have failed, which is a failure. In order to make up for his shortcomings, a newly developed nanotechnology was installed for him. It's K9999' s hand. A pathetic character who always thinks he is a loser. Try to prove yourself. Finally perverted.