A Supreme Demon Lord Pretends to Be a Rookie and Gets Used as an Experience Pinata by the Protagonists

A demonic cultivator unexpectedly becomes a Demon Venerable. He never imagined that being invincible would get old so quickly, so he falls into a deep sleep, waiting for an immortal cultivator to defeat him. But when he wakes up... things are even worse. The immortal sects have all become magic academies, and the Demon Venerable discovers he's been summoned to another world. How interesting. But what if he still wants to die? The Demon Venerable sets his sights on the world's number-one magic academy, disguises himself as a frail, innocent dead-last student, and even pretends to be this world's very own Demon King, teaching the chosen protagonist how to kill him. In this magical world of fairy tales and legends, the protagonist, Zeyue, has reborn with a secret. His heart is full of hatred, and he swears to make everyone who betrayed and hurt him suffer. But can someone explain why, in the world he's reborn into, there's suddenly another person who has taken the place of the Demon King he's destined to become?