Who was the cicada sword that year?

That year, the sword of cicada came and went in purple dust and sky dust, and the door was closest to the soaring man, a top fortune teller. Later, in the Ming Tombs, Xiao Yu tried to seize the opportunity of soaring, but was finally defeated by Xiao Yu. Cicada and Sword of that Year is a novel written by Mo Yu. The story takes Xu Beiyou as the protagonist and describes the story of a swordsman and Jianghu. When Xu Beiyou was young, he met an old man. Xu Youyou exchanged Xia Chan with the old man to see what this sword looks like. When he caught the cicada, he had all summer. When he catches the sword, he has rivers and lakes. Many years later, Xu Beiyou took this sword and walked through the rivers and lakes, either plain or bloody.