Black and white are impermanent, also known as impermanence. They are a pair of gods in traditional Han culture, and they are also the most famous ghosts. These two gods hold shackles and handcuffs and specialize in hunting down ghosts. "Bai Wuchang" is named "Xie Bi'an", who is tall and thin, with a pale face; "Hei Wuchang" is named "Fan Wujiu", who is short, fat and has a dark face.
But Bai Wuchang said: "These mortals are so abominable! I am Yushu Lingfeng, charming, and just like a handsome boy!" Hei Wuchang patted Bai Wuchang's head and said: "The King of Hell has an order. To catch ghosts, you must show your teeth and claws. Otherwise, you won't be able to scare people."