"Grandpa, didn't you say that all the angels in heaven are angels in white clothes! Why are there angels in black clothes?" I looked up innocently and asked the white-bearded old man standing with me. "Child, who told you that heaven is full of angels wearing white clothes? Although most angels wear white clothes, there are also angels wearing black clothes!" The old man with a white beard lowered his head and answered my doubts with a loving look on his face. "Ah! Doesn't that mean there are bad people in heaven too?" I said in surprise with my big round eyes wide open and my round mouth wide open. "Yeah! I understand." "Ah! Oh my god! There are bad guys in heaven!" I nodded while crying, as if I had really discovered the truth...