The Firstborn Son of a Concubine

After transmigrating to ancient times as the illegitimate eldest son of a seventh-rank county magistrate, liberal arts student Wei Shi spent his first ten years in a life of luxury, until his stepmother gave birth to her own son. From eldest young master to pitiful underdog, from an ordinary commoner to a first-rank official. This novel is entered in the "Science and Technology Strengthen the Nation" writing contest. Reason for entry: Using the knowledge he possesses, the male lead takes charge of building ships and uses them to sail far and wide, opening a sea trade route for the nation. Recommended exam-success novel of the same type: "The Legitimate Second Son" New novel now available: "A Wrong Turn into the Imperial Household [Tang]" Also known as "My Father, Emperor Taizong of Tang," "A Tang Dynasty Office Drone's Daily Life," and "A Prince's Self-Cultivation" According to the official histories, Emperor Taizong's assessments of his sons were as follows: About the crown prince: "Benevolent, filial, clever, and quick-witted!" About the third prince: "Brave and decisive, just like me!" About the fourth prince: "Tai is my son. I always want him by my side." About the ninth prince: "The Prince of Jin is benevolent and filial. If he becomes ruler, he will surely protect his brothers and give the people a peaceful life." About his adopted second son, Li Kuan: "All I know is entering the palace at dawn and leaving at dusk. I know nothing of nine-to-five work. All I know is a day off every ten days, not two days off every week. All I know is retiring at seventy, not at sixty. How dare this brat change the laws of my court?" A romance with a male lead. The couple gets together when they're adults. Theme: