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 the 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. but destiny thinks otherwise with great knowledge comes great responsibility and also a great deal of entanglement with the Emperor.