Fantasy, Start Immortality by Simplifying the Exercises

Li Xing traveled to a world of demons and became a down-and-out young man whose family was exterminated. Monsters are scary, but people are even scarier. Fortunately, he carries a simplified system. Any skill can be upgraded to the full level as long as the conditions are completed. Let's see how he punches all living beings, steps on demons, and embarks on the road to eternal life.