The book Ding Ding is written by the author Cao Wenxuan. Tintin and Dangdang in the book are two idiots. They were born in a remote mountain village. When Tintin 12 years old and Dangdang was 7 years old, their mother left home, and then their father died unexpectedly. Since then, these two unlucky children have lived alone with their elderly and groggy grandmother. In order to prevent them from getting lost, grandma bought bells and tied them on their hands to make them tinkle when they walked, so grandma named her brother "Tintin" and her brother "Dangdang".