Mathematics professor returns to daily life

Lu You, known as Professor Lu, was recommended to a prestigious domestic university. He is nearly thirty years old. He has made good achievements in the field of mathematics and has a promising future. However, an accident happened. Without any preparation, he came to another world and returned to the age of fifteen. In the gentle daily life, he met the rest of his life and learned how to love someone. To the dear readers : This novel isn't written by me but translated INTO ENGLISH!! It is a novel I read and loved. Original title: 数学教授重回日常 Original author: 十页人缘