One couldn't have existed in the martial arts world without encountering danger.
To avoid danger, one could use a pseudonym.
Lu Yuan had never relaxed in the aspect of stability.
Lu Yuan did not let his guard down even though he was only facing a demon king at the first transition of the Core Formation Stage.
He would not easily reveal his true identity.
After all, Lu Yuan couldn't be sure if the demon king had any hidden skills or powerful connections.
If the enemy wasn't eliminated, he could become a future threat.
Using a pseudonym would ensure that any problems wouldn't implicate his true identity.
This way, his safety would undoubtedly be greatly improved.
As for why he chose the name Xu Xian, it was simply a perverse sense of humor.
When he saw a big black snake that was more than ten meters long, Lu Yuan would naturally think of a certain 'Said Snake Hero'.
He casually called out the name Xu Xian.