Tom Bull, who has won many awards at home and abroad, cleverly combines painting, music and stories with his latest creation, which is refreshing and full of surprises! The warm and interesting storyline, coupled with the familiar melody of "Little Star", connects elements such as the pianist, cat and sardine together, making it a picture book that can be read, watched and sung. There are stories within stories. The classic Spanish children's song "Once upon a time there was Mr. Cat" has been added with interesting and novel imagination, and clever ideas such as searching and counting have been incorporated into it, forming many story lines that can be read again and again.