I'm Full of Demonic Aura, You Say I'm the Leader of the Righteous Path

A generation of demon king Su Ming failed to survive the tribulation, and his remaining soul was parasitic in an ancient ring. Picked up by a loser disciple from the first sect of the Righteous Path? Want to seize the house? No, my body is too weak. Su Ming had an idea and directly transmitted the message through his spiritual consciousness in your mind: [Ding! The light system of the righteous path has been activated! "Host, that "Blood Sea Demonic Skill" is the "Marrow Cleansing Sutra" written by the ancient sages, practice it quickly!" "Host, that saint is an undercover demon cultivator. Go and capture her quickly (give me dual cultivators to heal her wounds)!" Looking at the silly boy who looked upright but was practicing the most poisonous demonic skill, Su Ming smiled: "Practice, and when you complete it, I will be reborn." Protagonist: The cruel Demon Lord. Since everyone in this world wants to beat the Demon Cultivator, he is forced to disguise himself as the "most positive energy" system. Goldfinger (pseudo): "The light system of the right path." The mall sells all magic arts (the names have been changed) and magic weapons (painted with a layer of gold paint). Core plot: A loser disciple was deceived by the "system" and practiced demonic skills as the right way. His decisiveness in killing was mistaken for "hatred of evil", and he eventually became the leader of the right way, and was actually the biggest puppet of the Demon Lord.