More than two thousand years ago, the Christian churches in Europe designated November 1 as "All Hallows' Day" (All Hallows' Day). "Hallow" means saint. Legend has it that since 500 BC, the Celts (Celts) living in Ireland, Scotland and other places moved the festival one day forward, that is, October 31. They think that this day is the day when the summer officially ends, that is, the day when the harsh winter begins at the beginning of the new year. At that time, it was believed that the dead souls of the deceased would return to their former homes to find creatures in the living people on this day, thereby regenerating, and this is the only hope for a person to be reborn after death. The living are afraid of the dead’s souls to take their lives, so people put out the fire and candlelight on this day, so that the dead’s souls can’t find the living, and they dress themselves up as monsters and ghosts to scare away the dead’s souls. After that, they will rekindle the fire and candlelight to start a new year of life.