Impermanence, according to legend, is a life-seeking ghost who works for King Yama in the underworld. There is no Yama in the underworld, but there are still people who hold destiny.
As there is life and death, there is also impermanence.
Everyone in the world has said that if you see white impermanence, you will live; if you encounter black impermanence, you will die.
But no one has seen Hei Wuchang. Perhaps Hei Wuchang does not exist, or perhaps no one who has seen Hei Wuchang exists.