Invincible Starting from Sword Demon

I don't know how to write an introduction. It was a genius swordsman who suddenly became a top swordsman after being "tricked" by his father for more than ten years. All the classmates, instructors, and villagers who originally laughed at him were shocked. He demonstrated swordsmanship that amazed everyone, and he had almost abnormal physical fitness and defense. His swordsmanship is so superb that it can be written into textbooks. He has obtained the power of the first-generation Sword Demon, and he is invincible! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.