Let's talk about your second question first: both Zhouyi and Chinese medicine talk about yin and yang.
Yin and Yang actually refer to two aspects of things (for example, in space, because we are in the northern hemisphere, the south of the mountain is sunny and the north is sunny, while the topography of our country is high in the west and low in the southeast, so the south of the big water system is more vulnerable to water erosion, that is to say, the south of the mountain is sunny, and vice versa).
People also have yin and yang, generally speaking, the front is yang and the back is yin, corresponding to ren meridian and du meridian. The hand is in harmony with Baihui, and the perineum is below. People have yin deficiency and yang deficiency, and the symptoms are generally the opposite. According to you, people with yang deficiency are prone to ghosts? Talking about the symptoms of yang deficiency, there are three out of ten people. I haven't heard that the streets are full of ghosts! People are born every minute on the earth. Is it possible to be born on the same day of the same year?