Wu Xu is from Nan 'an, Fujian. He is proficient in martial arts and is good at playing the iron flute, which plays Yun Biao directly. But he never shows off, just becomes a peddler. He always hangs a flute on his delivery tool. When he meets a place with good mountains and waters, he will put down his baggage and take it down to play. At that time, a man named Li Ze was also good at oral sex. He had been to Shandong, but when he came back, he found that his wife and children had both died of an epidemic. Li Ze was in pain, so he shut himself in, picked up the bamboo flute and played it day and night. Dong Xiao's voice is very sad, and Li Ze is also very sad. Mix's voice added sadness, and everyone who heard it shed tears sympathetically, but no one dared to knock at the door to stop him. As it happens, Wu Xu passed by Li Ze's house and heard the bleak flute, so he said to his neighbor, "Who is playing the flute here? Listening to the voice seems to be sad for the flesh and blood relatives, but he has died of grief; Even if I go in and take his flute now, I am afraid I will die. " The neighbor said, "What should I do?" Wu Xu said, "I will save him with an iron flute." So he raised his iron flute and blew it. His flute and elegant happiness offset the sadness in Li's voice. After dinner, the flute in the room stopped. Everyone rushed in and saw the bamboo flute lying on the ground. Li Ze had fainted to the ground. Wu Xu stepped forward and felt Li Ze's pulse and said, "It doesn't matter. He should cut off his flute and boil it in water. " Everyone split Li Ze's flute, only to find a strand of bamboo covered with blood. They boiled Zhu Xiao in water and gave it to Li Ze. Sure enough, they soon woke up and turned around.