My Sister Insisted on Swapping Marriages, and I Became a Marchioness Instead - Chapter 5: Listen to What the Beauty Says

The apocalypse descends, zombies and monsters appear, followed by System Leveling, which grants skills to all survivors.With the collapse of law and order, some become powerful while others remain weak, and so the dark ages begin.

Devils, Requiem, Human.In Year 3000, Earth,An Apocalypse descended, beings calling them devils, came from nowhere, almost eradicating the entirety of humanity. But at the nick of time, an unknown ore was discovered, made into weapons called Requiem; a weapon of devastating power and strength.With Requiem, humanity counter attacked the devils, claiming victory over them, taking their lost lands back.Humanity later found a way to harness the power in Requiem, an unknown energy which was called Originat.With Foundation Established, Humans fought and fought, until the devils were almost wiped out.But evil can't be completely destroyed, as they stumbled upon a world shaking secret..Later in the years, evils rises again, devils going rampant, it's up to the younger generation to protect human lands.But an Anomaly descended, a devil, yet a human, but which side would he pick?The Devil Man!A huge factor that can bring complete destruction to both races. What would be its way forward?Read to know the world shaking secret and what would happen to Earth.A/N: The fun begins from when the MC awakens his talent, and his darkness begins when he enters a dungeon.Discord Link : https://discord.gg/GhWjYfbgCu

This is a story of a man named Kim Sae-Jin, who one day, inexplicably wakes up as a Monster. Follow him and his perilous journey to get his life back as a Human, all the while growing even more versatile as a Monster in the process. This should be… complicated, somewhat.