Marrying the Eldest Princess at the Beginning, I, the Nine Heaven Demon Lord, Was Exposed

A mysterious game [Shenxu] is popular all over the world! Lu Cheng has been playing for three years and has achieved great results. He is respected as the Nine Heavenly Demon Lord by countless players! However, once you travel through time, Lu Cheng unexpectedly logged into the Shenxu game in advance and became the good-for-nothing fiancé of the eldest princess of the Wu Dynasty! And at this time, Emperor Wu was seriously injured, the Wu Dynasty was on the verge of collapse, and the Immortal Sect was watching eagerly. Seeing that a disaster was imminent, Lu Chengren was paralyzed. What was the beginning of this horse-riding collapse? Fortunately, at the critical moment, you can awaken the system and regain the Jiutian Demon Lord account, which can be gradually unblocked! Congratulations! You marry the eldest princess of the Wu Dynasty in advance, unblock the Holy Body of the Great Dao, and enter the realm of heaven and man! Congratulations! You successfully destroyed the Daoxuan Immortal Sect, unlocked the Wusha Demonic Art, and the Nine Netherworld Palace! Congratulations! You successfully obliterated the son of the plane, unlocked the Nine Heavens Emperor Scripture, and inherited the Demon Lord...] …… My name is Jiang Shuyue, the eldest princess of the Wu Dynasty, the proud daughter of heaven! But now, the Wu Dynasty is about to fall, and I am in danger! I wanted to escort my fiancé Lu Cheng to escape from here first, but why did things become more and more wrong? "On your wedding day, why did you kill three heavenly beings with one sword?!" "Nine Netherworld Palace, why do the Seven Stars Immortal Land respect you?" "Wait a minute, why are they all kneeling down to you again and calling you the Nine Heavens Demon Lord?!"