Send Me to Get Married, but I Am the Prince and the Queen Mother

Alias of the novel: "I Built the Ming Dynasty in a Different World", "The Invincible Ming King", "The Unparalleled Emperor" Zhu Beichen traveled to a world of fictional history and became the only prince in the current dynasty. But this is not a good thing. The former emperor died and the demon queen took over, and the civil and military officials of the entire dynasty were willing to surrender to the demon queen. In order to claim the title of emperor, the Demon Queen made Zhu Beichen the crown prince, and she was sent south to marry him. Less than halfway, Zhu Beichen's soul had already changed. The current Zhu Beichen is a transcendent from the 21st century with a system. See how he kills the demon queen, destroys the Xiongnu, and achieves countless feats in this troubled world where thousands of kingdoms stand.