Ten years after humanity’s defeat, Earth has become a world ruled by demonic invaders. Cities lie in ruins, civilization has collapsed, and the surviving remnants of mankind live in constant fear under the oppressive reign of monsters.

Among the countless victims of this apocalypse is Yoon, a young man who loses everything—including the person he cherishes most, his sister.

After meeting a tragic end himself, Yoon is unexpectedly granted a final opportunity by a mysterious angelic statue. Instead of dying, he is sent back to the past, carrying with him a unique leveling system and the memories of humanity’s downfall.

This time, he refuses to repeat the same mistakes.

To change the future, Yoon must relentlessly grow stronger and reach the seemingly impossible milestone of Level 99. Along the way, he battles powerful demons, overcomes deadly trials, and uncovers secrets hidden behind the world’s destruction.

Unlike many heroes who fight for glory or the salvation of humanity, Yoon’s motivation is far simpler and far more personal:

He wants to save his sister.

Yet as his strength increases and the future begins to change, he gradually realizes that protecting the one person he loves may also determine the fate of the entire world. What begins as a brother’s desperate quest soon becomes humanity’s last chance to escape extinction.