The Heibai Wuchang (traditional Chinese: 黑白無常; simplified Chinese: 黑白无常; pinyin: hēibái wúcháng; Wade–Giles: hei-pai wu-ch'ang; literally "black and white impermanence") are also known as the 'Black and White Guards of Impermanence'. Like the niu tou ma mian, they are in charge of bringing the spirits of the dead to the Underworld. The Black Guard and the White Guard are in charge of evil and good spirits respectively. In some tales, they appear during the Ghost Festival and reward the good by granting them pieces of gold. There are statues of them in some Chinese temples, where they are worshipped, and they are usually depicted with ferocious snarls on their faces and long red tongues sticking out of their mouths to scare away evil spirits.
Read more about this topic: List Of Supernatural Beings In Chinese Folklore