With a Broken Secret Book, You Can Develop Invincible Swordsmanship?

Invincible flownonsensical High school graduate Ke Yuan has traveled to the fairy world filled with demons for a year. This place was extremely dangerous and he didn't dare to be careless. So he devoted himself to practicing the swordsmanship secret book given to him by his uncle - "The Sword of the Third Lady" One day, he embarked on the path of slaying demons. But I found something didn't seem right. How could these monsters and ghosts not be able to catch my sword? ! "I'm on it. I'm dead with one sword strike. What's there to say?" The victim, the centenary tree demon, was very aggrieved. "You said Mr. Ke, he is truly handsome." The oiran of Chunfeng Tower said this.