Signed In For Eighteen Years, Your Majesty Asked Me To Marry The Princess?

[Crown Prince+System+Cao Thief!]Li Xu traveled to a high martial arts world and had a check-in system at the beginning.Signed in for eighteen years, he appears to be the Crown Prince of Zhenbei, and his father owns 300000 Zhenbei troops.Behind the scenes, there is still the underground emperor of Da Qian - the leader of the Power Gang!Having super thugs from ancient Blue Star!Until one day, Emperor Daqian summoned Li Xu into the imperial city to marry Princess Daqian.Princess Daqian: As long as you marry me, you can inherit the title of Prince of Zhenbei!Demon Fairy: Your Highness, am I beautiful?Righteous Saint: For the sake of the world, I am willing to feed demons with my body.