I recommend the modern romance and urban life novel "A Lifetime for You" to you! The male protagonist, Wei Hansheng, was a famous banker on the financial street who had returned from studying in Germany. He was cold, silent, and aloof, while the female protagonist was a childhood sweetheart with high temperament and low EQ. There were emotional entanglements between them as childhood sweethearts, but there was also the high IQ of the rich and knowledgeable male protagonist and the female protagonist. The whole novel was warm and sweet, which matched the feeling of childhood sweethearts that you were looking for. I hope you like my recommendation, Mwah ~😗