Who!!

Who was a man with a black coat and cap. He usually came out at night time. One day he comes outside for a walk and at some distance, he walks along the road. He hears some sounds like 'help me! help me!! '.He went to that side and saw that an old man had fallen down on the road. He helps that man and asks him, "why are you coming outside on this night without any help? The old man told me that, "my son was kidnapped by someone and they ask money, so I decided to go there and bring my son. Who decided to help him. He takes over the money and goes there. When he entered the sight the kidnappers were scared and say "Sorry sir we kidnapped him without knowing that he is your friend's son", they escaped from Who. Who rescues the son and hands it over to his father. Why they are scared when seeing the who. Really who was Who!!!