After you summoned a demon from hell just to satisfy your curiosity but you realized your own mistake when summoning the most evil demon of hell because you indirectly create the next serial killer for this human world. Jan after being summoned by you, he kills humans instead of other demons in hell like before. You pass an alley and hear a faint voice of a man who looks like he is about to die, you go in and see the man staring at you and a familiar back in front of you... it's Jan