The "Holy Whole" Double Immortals, also called Holy Whole Gods, were traditional Chinese gods in folk custom worshiped for impetrating family concord and reunion as well as blessing a harmonious married life for newlyweds.

The earliest Holy Whole God was in the image of an eminent monk called Wan Hui. It's said that he was daft in appearance with not much intelligence. One day, Wan Hui determined to visit his soldier brother who was tens of thousands of miles away from home, because his mother missed him very much. Wai Hui made a miraculous journey and went back home the same evening with his brother's letter. Later his spirit of relieving people's grief upon separation and bringing back reunion made him a Holy Whole God worshiped by later generations.

During Ming and Qing Dynasties, the Holy Whole God was replaced by the image of Holy Whole Double Immortals, since people generally regarded that concord and reunion were the wishes between two people. The monks "Han Shan" and "Shi De" in Tang Dynasty then became the embodiment of the immortals, who had a profound friendship and even compiled a poetry book together.