According to the geomantic theory, due south is considered as the most vigorous direction of yang, and the cemetery belongs to the place with heavy yin. When the cemetery is just in the south of the house, there will be a conflict between Yin and Yang, which is considered to bring some bad effects, such as affecting family health, career development and interpersonal relationships.
However, it should be noted that Feng Shui theory is a traditional concept and belief, which has not been scientifically verified and demonstrated. Different people have different views and beliefs about Feng Shui. Therefore, some people may stick to the concept of Feng Shui and choose their houses according to these beliefs, while others may disagree with this view.
In a word, the influence of Zi Shan noon cemetery on residence is based on the traditional geomantic theory. If you are interested in Feng Shui, you can learn more about it. However, it should be emphasized that Feng Shui theory has no scientific basis and is for reference only.