The Da Er Ye Bo, literally "Black and White Impermanence", are two deities in Chinese folk religion in charge of escorting the spirits of the dead to the Underworld. As their names suggest, they are dressed in black and white respectively. They are the subordinates of Yama, the ruler of the Underworld in Chinese mythology, alongside the Ox-Headed and Horse-Faced Hell Guards. They are worshiped as fortune deities in Chinese temples in some countries.In some instances, the Da Er Ye Bo are represented as a single being – instead of two separate beings – also known as the Wuchang Gui literally "Ghost of Impermanence". Depending on the person it encounters, Da Er Ye Bo can appear as either a fortune deity who rewards the person for doing good deeds or a malevolent deity who punishes the person for committing evil.