Xiao Li’s Flying Knife is the work of Gu Long.
The original work is called "The Sentimental Swordsman and the Ruthless Sword", but the focus of it is mainly on Xiao Li's flying sword and Li Xunhuan, which has little to do with the sword of the title.
It is speculated that Gu Long’s original intention was to write this work as a follow-up to "The Outer History of the Martial Arts". The other male protagonist in the book, A Fei, was actually meant to be the illegitimate son of the hero Shen Lang in "The Outer History of the Martial Arts". , he is a swordsman, a quick sword master without any teacher. Li Xunhuan is an important brother and friend who he met as soon as he came out of the world and changed his life values.
However, the character Li Xunhuan was so successfully written that even the author fell in love with him, while A Fei's description was relatively weak.
So, this work should actually be titled "Xiao Li Flying Knife"