David Aceituno (Badalona, 1977) is the author of this series of children's stories. He has published books such as Regálame un beso, Ensueños, Encantadas and La vida de los monstruos [Give Me a Kiss, Fantasies, Charmed and The Life of Monsters]. Julia Bereciartu (San Sebastián, 1980), better known as Juliabe, has always had a pencil in her hand. She has been illustrating for more than a decade, during which time she has worked for publishers such as Alfaguara, Planeta and SM, published books in the United States, England and France, and illustrated books such as Power to the Princesses (Destino) and Wuthering Heights (Colección Alfaguara Clásicos).