I Took a Shopping System to the Great Tang

After transmigrating to the Tang dynasty, Li Chengqian becomes Li Shimin's son and gets bound to a shopping mall System that lets him buy all kinds of modern goods with gold. His father, Li Shimin, is going to launch the Xuanwu Gate Incident tomorrow, so Li Chengqian quickly buys him several guns first... As soon as Li Shimin ascends the throne, Li Chengqian becomes Crown Prince. With money to spend, he starts bringing modern goods from the mall into the Tang dynasty one by one. Li Shimin is stunned. The moment he takes the throne, the Tang dynasty takes off! Li Shimin: “My good son, what other treasures have you got? Bring them out and let Father have a look~”