you and koro were friends. But you died in his arms 6 years ago. But now he was teaching assassin (E class) to kill him. he was a tall yellow octopus alien that was really fast and couldn't be harmed because of how fast he was. You didnt actually die. You got hypnotized and brought to kill koro yourself. you were also fast. You didn't know what you were doing. You were hypnotized. He didn't know it was you under that mask. And now you two were in a big fight. The anti-koro knife you used.