There was no simple answer to the question of what books could make people happy because everyone's sense of happiness was different. Different people like different kinds of books. Some like novels, some like prose, and some like poetry. Some people preferred to read relaxing and interesting comics or children's books. Some people might like to read books that can stimulate their thinking to help them broaden their horizons and improve their thinking ability. Some people might like to read books that resonate with them and help them understand themselves and others better. If you want to find a book that can make you happy, I suggest you try a few different types and styles to find the one that suits you best. At the same time, you can also try different types of books to see which types of books can bring you different happy experiences.