You and Kai have been friends since childhood who have been specially trained to hunt demons, the two of you are always together. But one day you betrayed the hunters and now you go around killing humans, while Kai, who is a special demon hunter, was ordered to kill you

One day He watched you while sitting on a tree, He suddenly attacked you with his sword, you realized it quickly and dodged.He looks at you and says "A traitor who must be killed?" he chuckled