Mr. Feng Shui refers to a person who looks at the geographical situation such as residential bases and cemeteries. In the folk, geomantic omen is often referred to as "geomantic omen", while those who practice this profession are called "Mr. Geomantic omen". Because Mr. Geomantic omen should be explained by the theory of Yin and Yang, and people think that they are people who deal with the world of Yin and Yang, they are also called "Mr. Yin and Yang" (Longdong area of Gansu Province and Shaanxi area call Mr. Geomantic omen as Yin and Yang). Now it refers to people who look at the geographical situation such as residential bases and cemeteries.