Are There Flaws in Cultivating Immortality? Can I Use My Lifespan to Become a True Immortal?

[No heroine] Chen Shou opened his eyes and saw that he had actually traveled to the world of cultivating immortals. At the beginning, he was sold to a mine to mine, and he happened to be able to cultivate immortality. What are the flaws in cultivating immortality? Can I increase my lifespan infinitely? Stud directly! ! ! ! !