After Living in Seclusion for a Long Time, Descendants Come to Visit You at the Beginning

Li Changsheng was unable to practice after traveling through the fantasy world! How did he become the ultimate master after acquiring the system? After creating hundreds of forces, why did he retreat to the mountains and forests? Why did Li Changsheng become a protective patriarch after living in seclusion for thousands of years? All of this started from that day when a girl whose sect was about to be exterminated came to look for him...