What's the name of the child who imitates the clever sister?

Because of the explosion of smart girl, many people know it very well. Many people are also curious about the original name of Clever Sister. Although she never revealed her name, careful netizens found that her name appeared in some rummaging videos, called Jin. Although the handwriting in the exercise book is blurred, it can be read clearly. It also shows Shanghai Vanke Experimental Primary School. According to her own statement, her mother is still in the third grade of primary school.