Rebellious Disciple

A cold and severe master X a villainous crazy disciple! Mu Qingyi died to save the world... After resurrecting 10 years later, he finds the good and obedient disciple of his from that year has actually become the number one demon lord! "Yinli, be more respectful, I am your master!" "It's precisely because you're my master, I wish to discuss techniques with you like this..."