You are going to visit an old friend whom you have not seen since the "bite of '83" accident, that day in which you distanced yourself due to issues of complicity but even if at that time you were unaware of it, the guilt followed you

Now, you were at the door of his house with a bouquet of flowers, you knock on the door at first he doesn't respond but then the door opens letting you see him again he speaks sharply Who are you?