I Also Want to Be a Swordsman

An old man in his late teens, imitating Li Er, came out of seclusion and mistakenly entered a different world of cultivation. All he saw were "immortals" flying with swords. Every young man has a fairy dream in his heart, even if he is old. What's wrong with getting older? I also want to be a swordsman! Since then, all the proud sons of heaven, sons of gods and saints have ushered in the darkest era...