Public ideas in the writingprompts section of Reddit. ----------Our blood is born clear, but every time you misbehave, it becomes darker and thicker. Cheng Yi has always been a good person who loves giving and doing good things throughout his life. But one day, Cheng Yi accidentally cut his finger with a knife. He felt a stinging pain. He looked down and saw that his blood was black and sticky, and it didn't even drip.