I Rely on My Understanding to Seek Immortality

Members of the Jiang family never live past the age of thirty. Jiang Nuan didn't want to die, he wanted to fight for a way to survive. Fortunately, his understanding is a hundred million points better. So, he drew his sword and pointed it at the aristocratic family that looked down upon human life, the tyrannical sect, and the monsters that poisoned all living beings. However, although the disease was congenital, the disease was not cured; the foundation was established, but the disease was still there; and the golden elixir was applied, why did the disease become more serious? Jiang Nuan could only search up and down, trying to get chestnuts out of the fire. The Nascent Soul has been born, so it's time to stop being trapped by bad diseases, right? The soul has already left the body, so we shouldn't worry about sudden death all day long, right? The thunder tribulation has been passed, and if you cough up blood, you will be rich for thousands of miles in the world... It wasn't until many years later that he suddenly realized that the eternal life that everyone was pursuing had been by his side from the beginning. As long as he was willing to pay the price, he could have eternal life at his fingertips. But, what's the cost?