In LOTR with Harry Potter system - Chapter 7: Prank Spell

Read at least six chapters, then prepare to crave the rest.The main character will show up in Chapter Five, though I don't recommend skipping the first four chapters.-----The world was celebrating. The Demon King was dead, along with his Darkness Generals.Humans led the other races to war for subjugation. They killed all, and none were spared. However, thousands of years before this happened, a piece of history was altered by time itself. In fact, the Demon King didn't have four generals but only one, which he sealed and sent into eternal slumber. Just as he started to close his eyes, the chains locked away for eternity shattered into pieces.

“I can’t accept this! I can’t! Even as a ghost, I’m going to spend eternity cursing that your relationship will shatter like glass! Break apart like a pair of mandarin ducks that fly away from each other!” With such a persisting obsession, it would be difficult for the vengeful departed spirit to move on.

Zhao Yi woke up to find himself in a romance novel set in a Mystical World, where he became the supporting male character driving the plot between the male and female leads!And he’s not just an ordinary supporting character — he’s the sixth prince of the royal family, rich and powerful.However, the female lead, who is supposed to be his fiancée, falls in love with the male lead — a young monk who possesses a ring which contains his master’s soul serving as his golden finger.This time, no longer clouded by love, Zhao would do whatever it takes to get his revenge.

What got summoned was the world’s strongest sociopath.