There are only three butterflies named Sheila in the world. They are famous for the evil smiles behind their wings. Some people say that is the smile of Sheila, so they are named Sheila. Sheila is the backbone of God's fallen angels, mainly sent to punish evil people or killers of other angels. No one knows his life experience because no one dares to get close to him. Legend has it that it appeared once as early as the first time Noah built the ark, and instantly created a flood that submerged everything in the world. The second time was three days before the Doomsday Judgment, when he appeared again, and that time he killed one-third of mankind. Now some people say that they saw it in the country of Mu on the mainland. As for when they saw it, there is no detailed record. The people who claimed to have seen it were also said to have been killed.