I Don't Know How to Cultivate Immortality, but I Understand the System

Li Xu knew that he was not a good person, but it was limited to small things such as not helping an old lady cross the road, petting an old dog on the roadside when nothing happened, and casually killing a dozen scumbags. But why! God actually did this to me, allowing me to travel to this place where nothing matters! Um? What are you saying, I am the young master of the Demon Sect? What! Are there people from the Immortal Sect ready to come and suppress the bandits? Before Li Xu could react, the beautiful master came with a sword. In order to successfully become a disciple of the beautiful sword fairy, Li Xu had to... "Quick, system, upgrade it for me!" [Report to the host that the skill is at full level. "But why don't I feel the call of power?" [Report to the host, the panel is just decoration. To gain power, please do special tutorials on the system! "Damn it, I still have to take tutoring lessons when I get to another world" Li Xu cursed and took tutoring, his strength +1 [Report to the host that the system has failed and will be repaired and upgraded soon! … This is the story of Li Xu gradually dominating the world with two mentally retarded systems. Many years later, Li Xu stood on the top of the mountain and found out when he looked at himself. Demon doors, demon bodies, demon skills, demon swords, demon dragons... But I am obviously a decent person!