Please recommend a wuxia novel and introduce it.

I'm looking for a martial arts novel. I forgot who wrote it. He only remembered that there were many mysterious things in the article. The protagonist of this article was a young man. He went to seek refuge with a man surnamed Gu, who seemed to be his martial uncle. The son of the man surnamed Gu went missing. His son was Gu Xiaodong or something. He had forgotten. The master of the protagonist gave him a brocade bag with all kinds of pills and a very powerful hidden weapon that could fly out many knives. His master seemed to be a cripple. There was also Butler Zhou inside. I remember that Butler Zhou fell into the water and drowned. There was also a person called Hua Hudie. He seemed to be the manager of a big family. All seven of his sworn brothers used whips. There was also a book that said that there were two old men who were very strong in martial arts. They exchanged palm strikes every day in the mountains and later mastered peerless martial arts. One of them was called Qiqiao Yinyang Palm, and the other was called something forgotten. Later on, when these two old men grew old, they severed their heart meridians and died, leaving behind the martial arts they had practiced. It caused a fight. It's a novel I read ten years ago. Can someone tell me the name and details of the book through the details? I'll give you these 30 points. Thank you!