Color Poaching (Criminal Investigation)

In this world, human beings are born with color, and color means life. The brighter the color, the more alive the person is. When your color fades, your life comes to an end. In order to survive, some people are poaching other people's colors. Random thoughts: I happened to see a half-colored work by an artist a few days ago, and I suddenly thought of this joke. Hehe, I was originally considering writing a tender story or a thriller, but after thinking about it, I suddenly wrote a criminal investigation story? Purpose: There is only one truth