Demon Sect is one of the three major Demon Sects on Heavenly Dust Continent. The moment Lu Xun became the junior elder of the Demon Sect, his name spread throughout the entire Cultivation World.
So, the words "Demon Sect's Lu Xun" hold great significance.
And his implied message is: "I am Demon Sect's Lu Xun, have you heard of me?"
Mo Beipo isn't exactly uninformed, he is the leader of a sect after all, how could he not have heard of the rumors.
Moreover, just a short while ago, the junior elder of the Demon Sect had profoundly defeated Ye Sui'an, whose possesses the Innate Sword Body talent. This news was all the rage in the Cultivation World!
However, Lu Xun of the Demon Sect rarely shows his face in the Cultivation World, so apart from the members of the Demon Sect, there are only a few cultivators who have seen his true face. So, it's not easy to confirm his identity all at once.
We can't just trust him because he says he is Lu Xun, right?
