The Emperor's Peerless Son-in-Law

Chen Feng is transported to the Great Tang era, where he accidentally spends a night with Princess Changle — and awakens the "Peerless Imperial Son-in-Law" system. Armed with modern knowledge, he saves the empire from a locust plague, improves the army's saddles, invents penicillin to cure the empress, and wins the trust of Li Shimin himself. Then he passes the imperial exams, wipes out the mountain bandits, breaks the great clans' monopoly, introduces new paper and metallurgy, and trains an elite squad of veteran soldiers. In the end he helps the crown prince take his place at court, is granted the title Duke of Xian, and marries Changle — his rise has only just begun.