Is the fortune teller in Shantang Street true or false?

It's true. Fortune-telling originated from the Book of Changes and is a materialistic thought. The Book of Changes is the crystallization of the wisdom of ancient sages and a famous philosophical work. I ching is called the first classic. Therefore, fortune telling has certain accuracy. But mainly depends on the level of fortune tellers, all of them are literate, some are primary schools, some are high schools, and some are doctors.