The Tang Dynasty's Strongest Crown Prince's Son

Li Xiang, the eldest son of Li Chengqian, the deposed crown prince of the Tang dynasty, and a descendant of Li Shimin, is possessed by the soul of a young man from the modern era and obtains an Emperor-Building System. By completing missions, he can earn money, weapons, elite armies from every dynasty, and mighty generals. Beep! Congratulations, Host, on completing the mission to secure your father's position as crown prince. Reward: 3,000 Snow Dragon Cavalry. Beep! Congratulations, Host, on completing the mission to suppress the rebellion in the capital! Reward: 6,000 Imperial Guards of the Han dynasty, commanded by Huo Qubing. Beep! Congratulations, Host, on completing the expedition beyond the northern frontier! Reward: 10,000 Xiongnu Iron Cavalry, commanded by Chanyu Modu. With the System's help, the Tang Empire, led by Li Xiang, conquers cities and territories and wages war across the land.