Li Yuanxing, a modern idle man who had not even obtained a diploma in high school, traveled through time. He traveled through time when mourning his brother who had not had time to meet his last time and came to the Tang Dynasty on the third day of the Xuanwu Gate Incident. Li Shimin looked like a dead brother, but Li Yuanxing was like Li Shimin's younger brother who died underage. Li Yuanxing became Wulang and Li Shimin's younger brother! On the day Li Shimin ascended the throne, Li Yuanxing was named king and inherited the title of Qin King. Since he came to the Tang Dynasty, he should do something, and Li Shimin's first task to the new Qin King was to appease the aristocratic family. This task was very simple. It was to marry the aristocratic family and appease the aristocratic family. After the great famous prime minister Fang Xuanling conveyed the will of the greater emperor with an extremely mourning mood. Li Yuanxing's life in the Tang Dynasty began with marrying the princess.