[Refreshing story + pay-to-win leveling + ruthless killing + invincible among its peers + protagonist is an all-around warrior]

Gu Cheng transmigrated to a world of demons and monsters, becoming a minor official in the Demon Suppression Division.

Betrayed by an insider right from the start, he became food for the pig demon, and his life was in imminent danger!

In a moment of crisis, Gu Cheng activated the [Life-Saving System].

By consuming one's own lifespan, one can infinitely deduce martial arts techniques, and even replenish lost lifespan by slaying demons and evil cultivators.

"After thirty years of dedicated effort, your 'Iron-Cutting Sword Technique' has reached its pinnacle, achieving perfection!"

"After five hundred years of dedication, your 'Burning Flame Technique' has broken through its limits, and you have mastered the ultimate technique - the Golden Body of the Flame Demon!"

"Having spent two thousand years of your life, you have completely refined and analyzed the 'Ghost King Demon Core,' and comprehended the divine power - the Five Ghosts Devouring Heart Curse!"

"Slay the thousand-year-old demonic dragon and gain three thousand years of lifespan!"

...

Many years later.

As Gu Cheng fought his way through demons and monsters, growing stronger with each passing moment, he nearly wiped out all the demons and evil spirits in the world.

Suddenly, I realized that I had already trod upon countless bones and attained the supreme Dao.

May it live as long as heaven and earth, and be immortal for all eternity!