The beginning of the story of the Tang Dynasty's Imperial Son-in-Law: A rhinoceros comes knocki

Transmigrating to the ninth year of the Zhenguan era, Wang Zhihuan was bound to a merit system. Doing good deeds increased his merit, which could be exchanged for technology—Champa rice, movable type printing, basic pharmacology—all wonders of an agrarian society. He had no intention of getting involved in court affairs; he only wanted to farm and accumulate merit points. However, things took a turn when the four-year-old Princess Sizi accidentally wandered into the farm—System notification: Your cooking has attracted the attention of the royal family. System notification: Your medicinal tea has alleviated Empress Zhangsun's illness. System notification: Your rice has kept Li Shimin squatting on the edge of the field watching for a whole incense stick's time. From that day on, Wang Zhihuan was forced onto a path of no return: using his genetics paper to prevent inbreeding, marrying Princess Changle to persuade the Crown Prince to abdicate and replace him with Li Zhi based on "happiness index," orchestrating a bloodless coup to destroy the Turks and pacify Goguryeo, achieving great merit without ever being on the front lines, and having his legitimate princess enter the palace. Li Shimin smiled bitterly: "My daughter, all of her has benefited you, you brat."