The rare thing in the world, "Butterfly Loves Flower", looks like poison but not poison, and looks like poison but not poison. The person who is possessed by this thing will first fall into a deep sleep, with a cold body. Gradually, the body will produce strands of cocoon silk, and then become a pupa. In ninety-nine and eighty-one days, it will turn into a cocoon and become a butterfly. This thing lurks in the body, eating away at the internal energy every day until the host is exhausted and forgets. It is just like a butterfly sucking the nectar that it depends on for survival, hence the name.