I Became A Flashing Genius At The Magic Academy - Chapter 402

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

The hero who was killed by the demon king ended up reincarnated as the son of the one who killed him! Thus began the life of the hero who donned in the mask of the ideal demon prince to topple his own kingdom while doing his best to prevent anyone from discovering his identity―― But to do that and blend into the demon tribe society, he had to kill his former comrades. Nevertheless, to become stronger, to save humanity, he had to walk through all kinds of paths of carnage! This is the tale of the demon race’s fake prince destroying his own kingdom.

O Hero, Trample Those Who You Should Protect!

TN: Most part of the other character in the novel is depicted from a non-human perspective so expect something that is completely different from the common sense of human.

People keep assuming I’m some kind of evil mastermind.But seriously, I’m just a son-in-law freeloading off my noble wife’s family.…Why does everyone look so suspicious?Wait—don’t tell me. Is it because of my squinty eyes?!

Jade Hunter? The man which many women want to meet? If she really was a girl, then if she were to dress in a female attire… wouldn’t she look beautiful and refine? She is his fiancee? Could it be that she disguised herself as a man to avoid marriage? She would rather go catch thieves and hunt for bandits than to marry this wangye?

No, he will not let this happen! She is bound to be his!

For the arrest of a bandit, she became the hostage and jumped off a cliff? Dead?

…Nonsense! He does not believe! She is destined to become his wife, and he will find her…

Found her!

Although she repeatedly denied and repeatedly avoided him, he will find a way to let her fall in love with him!