Dajing's Prodigal Son

Li Zheng, a civil engineering major, traveled to the imaginary Jing Dynasty. He had no interest in fame. He could neither coax beauties nor emperors. He seemed to know nothing but immersed himself in the study of civil engineering. But, how can this profession change its flavor as you continue to practice it? (PS: This is a story about a male protagonist who comes from scratch and gradually becomes stronger...)