Who Let Him Enter the World?

He used to be Long Aotian, who was extremely talented and capable of wielding a sword to the end of the world, but he fell into my shabby yard in a state of embarrassment. I am just a small person who fishes in the market and dreams of being successful, but I happen to have an outrageous ability - I can dismantle all the martial arts I have seen. Xu Haoran felt that my "fake boxing skills" were unseemly, but he had to rely on it to save his life from the Nether Sect's pursuit. I think this genius is too capable of causing trouble, but because of the strange poison in his body, his hair turned gray overnight, and for the first time he wanted to risk his life for someone other than himself. The world is in turmoil, one of us has a bright sword like a rainbow, shining brightly; the other has a hint like a chess piece, tearing apart the universe. We have gone from being brothers who rely on each other for life and death to adversaries who have different views on the righteousness of life and draw swords against each other... At the top of this martial arts journey, will we finally reach the same destination through different paths, or will we end up in a different world?