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Underworld marriage, also known as bone matching, yin marriage, ghost marriage, and spirit marriage, is a marriage involving the dead. It is a folk custom in some countries. In China, after the betrothal of a man and a woman who died, or a son or daughter who died before the betrothal, the parents are in a loving and nostalgic mood and want to complete the marriage for them, which is a medieval marriage. Underworld marriage is divided into "the dead and the dead" and "the dead and the living" two. In addition, in the past, the ancestral graves in a lonely grave will affect the prosperity of future generations, inauspicious, so the deceased to hold a medieval wedding.

Once upon a time in the folk meditation wedding more in the rich families, poor people rarely have meditation wedding, Taiwan in the early years of the countryside was also popular. In recent years, the flourishing of the phenomenon of meditation marriages in northern China, coupled with the abundance of men and women, female corpses are available, there are many cases of theft of female corpses and the killing of women for sale, many women have become victims of the practice of meditation marriages.