An Engineering Nerd in the Tang Dynasty

When he woke up, the bustling world had faded away, and a modern engineering nerd had somehow arrived in the Great Tang of the Zhenguan era! As an engineering whiz with martial arts skills, technical know-how, lofty ideals, and a good education, no, as an engineering nerd, Li Zexuan only wanted to stay home, cuddle his wife, play cards, sleep, and read novels, living a leisurely life of "one partner for a lifetime, half-drunk and half-awake through the years." When he had nothing better to do, he could teach a few apprentices and have them go out in his place. But then again...