Thirteen, has always been a mysterious number, in the West, people will recognize it as an ominous number, many buildings are not set up with thirteen floor and room numbers. Some even believe that thirteen is a symbol of the devil. This book depicts a mysterious family of thirteen siblings with a mysterious mission, who have angelic looks and unpredictable personalities and abilities. They seem to be sowing fairy tales and sowing evil, they seem to be collecting beauty, and they seem to be luring human beings to sign a "devil's contract" with them. They wander in every corner of the world, appearing in every junction between darkness and light, hiding in every inconspicuous corner of different times and different eras, and no beautiful creature can escape their pursuit, and no evil wish will be guided by them. Are they humans, or are they gods? Are they demons, or are they fairies? Do their eyes ever show emotion? Is their fate, fortunate, or unfortunate? "In this world there are always people born and people die, it is something that no one can guess, just like my name: Thirteen. My brothers and sisters, each with different abilities and missions, some cruel, some compassionate .My mission is to bring home those lost and sad "children" who, deprived of love and warmth, can only be warmed by the heat of their blood, and can only feel their existence when they see the pain of human beings. "This is a horror fairy tale with a light color of blood and melancholy, please take Suki's hand and sing the nursery rhyme that has been forgotten in the depths of our memories.