Love History Caused By Willful Negligence - Chapter 4Vol. 1 :

In a future city intertwined with science, magic, and various races, a fearsome villain lives.“How dare you try to use such a young child. Do you have no conscience?”“It’s truly regrettable. To think that this girl could be the key to eradicating a den of evil.”“You can rest easy now. We will definitely protect you.”Sorry, but I’m actually that villain…It seems like a serious misunderstanding.

Born as a lowly goblin, Leav refused to accept fate’s cruelty. Through sheer will and tactical brilliance, he clawed his way up—evolving, battling, and commanding monsters who once saw him as nothing. But power comes at a cost. As war rages and enemies lurk in shadows, Leav faces betrayal, brutal losses, and the cold truth—strength alone won’t forge a kingdom. With ancient magic resurfacing and rival factions closing in, can he rise above mere survival and claim true dominion? In a world where the strong rule and the weak perish, Leav must choose: remain a pawn or become a king.

The whole world is subjected to a highly dangerous standardised exam called the Global University Entrance Examination. Answering questions by putting their lives at stake, they would live if they passed the test. Every month the exam will undergo reformation while, occasionally, it is random.

- Description from Novelupdates

The eldest son of the assassin aristocrat Tuatha Dé.

The skill, experience, knowledge of the previous life, magic, all of which grows his power as an assassin.

Excellent assassins pass through. He was usually admired as the ideal lord, and behind it wielded a blade as an assassin aristocrat.