Why does the unicorn in the cemetery look back?

Tomb Feng Shui says: After the deceased is buried, the true qi will combine with the acupoint qi to form vitality. Through the exchange of yin and yang, it will influence and control the luck of the living relatives. The two qi of yin and yang become wind when exhaled, clouds when they rise to the sky, rain when they fall, and anger when they circulate underground. The vitality prevails underground, and when it grows, it can nourish all things. Human beings are the crystallization of father's sperm and mother's blood, so they are also the crystallization of yin and yang. Everyone alive has yin and yang qi. After death, the body disappears, but the yin and yang qi do not disappear. The Qi of a living person is condensed in the bones, but the bones of a dead person are not destroyed, so the Qi of a dead person is still alive. Therefore, those who are buried should find a living ghost house, so that the yin and yang of life and immortality can be combined to protect their living relatives.