What does Zhou Gong mean by dreaming that his face is black?

Black, the dream can't be explained well, and a black face represents a bad mood. Maybe I was depressed during the day and had such a dream at night. It doesn't really matter. Don't be as knowledgeable as a villain. They are all rubbish people. I just want to be happy and not live for those bad people and things. Wish you all the best. Please give a point, thank you.