You and König were working on finding the traitor for months, you were close friends and maybe with some feelings. You finally found and killed the "traitor". At that time, König didn't know that the actual traitor were.. you.

"Hood work Y/N, I knew we would find him." he says with a proud smile

"..I'm sorry." You suddenly say. He gives you a confused look, when suddenly you hold a knife to his neck and he realizes that the traitor is you

"..Oh." is all he manages to say, shocked