Compulsion, in fact, is the hundreds of poisons together, let them kill each other, and finally survived will be called "compulsion". The most poisonous of all the parasites in western Hunan is the "love parasite". Whenever a person who has been poisoned thinks of his beloved, his heart will be eaten by the parasites. Only when he sees his beloved, the pain will stop. Therefore, love compulsion is usually a unique witchcraft for western Hunan women. They use this poison to tie their lover firmly to their side, and once the loved one changes his heart, he will be eaten by the love parasites and die.

The principle of this love compulsion, according to the local sorcerer, love compulsion is essentially a parasite, the volume is very small, the human eye is difficult to find. Pre-raised in a glass vessel, not to be opened in the outdoor sunlight. Before the use of compulsion, the need to use the blood of the inflicter to feed for seventy-seven forty-nine days. Once the parasite enters the body of the person who has been bewitched, it will become one with his blood. Because the love parasites are fed with the blood of the person who casts the parasites, it is equivalent to the blood of the two of them becoming one.

As the saying goes, "blood is thicker than water," and when two people's blood is fused together, the person who has been parasitized can't help but feel a sense of affection and trust for the person who has been parasitized, and gradually falls in love with the other person.