Ash falls over the obsidian spires of the Demon Realm, where the strongest feast on the weak and the throne belongs to the ruthless. Yet the current heir to the crown is a shivering, pint-sized sovereign who cannot even light a candle with his hellfire. Into this brutal court steps a modern strategist, pulled from his own life by an abrupt reincarnation. Appointed as the personal tutor to this pathetic prince, his new job is a glorified death sentence. Rival archdemons already circle the palace, waiting for the perfect moment to execute a bloody coup. A grim webtoon chronicles his desperate gambit: survival depends entirely on turning this fragile kid into a tyrant capable of crushing his usurpers. With a useless disciple, zero martial prowess of his own, and the clock ticking down to an inevitable invasion, how does a mere human teach a monster how to rule before they both lose their heads?

fantasy, isekai, demon king, mentor, magic, action, survival, comedy, reincarnation, webtoon