" Impermanence " was a Chinese web novel that mentioned the King of Hell and Black Impermanence. The King of Hell was a ghost official in Taoism who was responsible for judging the reincarnation of life and death in the human world. In the novel, King Yama and Black Impermanence were depicted as mysterious existences related to hell on earth. They not only had the function of judging life and death, but they were also related to local folk beliefs. Black Impermanence was one of King Yama's subordinates. He was described as a ruthless and vicious character. The main purpose of his existence was to carry out the orders of the King of Hell, supervise the reincarnation of life and death in the human world, and protect the ghosts in the human world. The main purpose of writing Yama and Black Impermanence in novels was not to tell a horror story but to better show the world and worldview in novels. The existence of King Yama and Black Impermanence and the setting of hell on earth added mystery and horror to the novel, while also showing the other side of society and the human world in the novel.