When Lin Chen changes classes, he unexpectedly awakens what is widely regarded as a useless profession—the Swordsman. Abandoned by his family and having his engagement broken off, he becomes a laughingstock. No one knows that his awakened hidden class is actually Sword Immortal, granting him overwhelming combat power. He effortlessly crushes dungeon after dungeon and obtains legendary equipment before venturing alone into the Demon Realm. Amid a blood-soaked battlefield of slaughter and conspiracies, he gradually carves out a fearsome reputation.