The original name of the full animation of Black and White Warriors is "Black and White Impermanence", adapted from the comic work of cartoonist Yu Yanshu. The full animation of Black and White Warriors tells the story of: On the edge of our world, there is another world. There is a professional team of two people who shuttle between the human world and the underworld every day. They come and go without a trace, with shrewd means and powerful magic. They take it as their responsibility to collect human souls and maintain the balance of yin and yang in the human world. They are Black and White Warriors. The protagonists of the story, Xiao Hei - Apprentice Black Wushuang and Xiao Bai - Apprentice Bai Wushuang, are super late kings. They are always late for any occasion. They are the youngest Black and White Warriors in the underworld. In the six months since taking office, they have not completed a single mission, so they always make King Yama angry.