What is the legend of the Seven-Star Longyuan Sword among the Ten Divine Swords?

It is said that this sword was forged by two great swordsmen, Ou Yezi and Ganjiang. Ou Yezi and General Qian made the sword, cut open Cishan Mountain, released the mountain stream, and led it to seven pools surrounded by the Big Dipper next to the sword-making furnace, which were named "Seven Stars". After the sword is completed, looking down at the sword body is like climbing a high mountain and looking down into the abyss. It is ethereal and deep, as if there is a giant dragon lying on its back. It's called "Long Yuan". Although the craftsmanship of this sword is exquisite, its fame is still due to ordinary fishermen who cannot know its real name: Yuzhangren. It is said that Wu Zixu was killed by a treacherous minister and fled to the end of the world. He was chased by Chu soldiers and horses. On this day, he panicked and fled to the bank of the Yangtze River. He saw only the mighty river and its vast waves. There was heavy water in front of him and there were pursuers behind him. When he was extremely anxious, Wu Zixu found a small boat coming rapidly upstream. The fisherman on the boat kept calling him to get on board. After Wu Zixu got on the boat, the boat quickly disappeared into the reed pond and disappeared. The pursuers on the shore left in anger. The fisherman carried Wu Zixu to the shore and gave him food and wine to have a feast. Wu Zixu thanked him profusely and asked him his name. The fisherman laughed and said that he wandered on the waves, so there was no use for his name. He could just be called "Yu Zhangren". It is said that Wu Zixu was killed by a treacherous minister and fled to the end of the world. He was chased by Chu soldiers and horses. On this day, he panicked and fled to the bank of the Yangtze River. He saw only the mighty river and its vast turbulent waves. There was heavy water in front of him and there were pursuers behind him. When he was extremely anxious, Wu Zixu found a small boat coming rapidly upstream. The fisherman on the boat kept calling him to get on board. After Wu Zixu got on the boat, the boat quickly disappeared into the reed pond and disappeared. The pursuers on the shore left in anger. The fisherman carried Wu Zixu to the shore and gave him food and wine to have a feast. Wu Zixu thanked him profusely and asked him his name. The fisherman laughed and said that he wandered on the waves, so there was no use for his name. He could just be called "Yu Zhangren". Wu Zixu thanked him and said goodbye. After walking a few steps, he turned around and took off the three-generation sword from his waist: Qixing Longyuan. He wanted to give this sword worth a thousand gold to his father-in-law to express his gratitude, and asked his father-in-law to express his gratitude. Never reveal your whereabouts. The father-in-law took the seven-star Longyuan sword, looked up to the sky and sighed, and said to Wu Zixu: "I saved you just because you are a loyal person of the country, and I have no intention of repaying you. Now, you still suspect that I am greedy for profit and have little trust, so I have to use this sword to show my nobility." "After saying that, he stabbed himself with a horizontal sword. Wu Zixu felt inexplicably regretful.