Demon Suppression Bureau: Trading Lifespan for Immortal Power

Reborn as a lowly clerk in the Demon Suppression Bureau, Gu Cheng faces betrayal and becomes a pig demon's next meal. At death's door, he awakens a forbidden system: burn lifespan to master any martial art instantly, then reclaim those years by slaying demons. Thirty years buys perfect saber mastery. Five hundred years unlocks a legendary flame body. Two thousand years grants cursed divine abilities. Every demon slain refunds his sacrifice—with interest. In a world where monsters devour humans and cultivators prey on the weak, Gu Cheng walks the razor's edge between mortality and godhood, gamb…