Learn and live until you are old. After Li An's soul traveled to the world of immortality, he activated the longevity system of learning more. Every time he improves his skills, he can get a lifespan reward. Others practice hard in order to live forever. He traveled around to learn skills hard just to get a lifespan bonus. Unknowingly, he has practiced countless skills and is famous in the world for his skills.
It's okay, but it's too short.