Otaku Engineer in Great Tang Dynasty

Novel Summary
Waking up in a fourteen-year-old body, Li Zexuan a modern-day engineering otaku unexpectedly found himself in the Great Tang Dynasty during Emperor Taizong’s reign!
When modern technology, lazy ideals, and 21st-century culture confronts Confucian orthodoxy the era of engineering has begun.
Though Li Zexuan only wants to stay at home, hold his lady, play cards, sleep, read novels, and live a life of leisure.
Destiny thinks otherwise with great knowledge comes great responsibility and also a great deal of entanglement with the Emperor.
– Description from Novelupdates