Ask for the name of a martial arts novel

The content was about a young man who accidentally entered a cave and became the disciple of the Bull Demon King (who later died). Then he went to look for the treasure left behind by Zhang Sanfeng and a secret manual of an evil sect.
The plot was roughly as follows: After the Bull Demon King (nickname) passed his martial arts to the protagonist, the protagonist went to a deep pool to learn martial arts (Beggar's Sect's Dog Beating Stick Method). The Bull Demon King was killed by the enemy. After the protagonist learned it, he disguised himself as the Bull Demon King to take revenge (I only read the first volume at that time)(Downstairs is wrong!!!!!!!)

Answer 1

There was a swordsman named Lin Qingxuan who had been in Jianghu for many years and was widely praised for his superb swordsmanship and noble character. However, with the turmoil in Jianghu, Lin Qingxuan began to realize the importance of peace and decided to give up swordsmanship and live in seclusion on a small mountain to spread the concept of peace and help others get out of trouble.

The name of this wuxia novel could be called " The Great Sword Wall ".