After mysterious dimensional rifts tear open across the world, countless monsters flood into human territory, destroying cities and driving civilization to the brink of collapse. Faced with an unprecedented catastrophe, humanity enters a new era where survival depends on becoming a Class Shifter and gaining the power to fight back against the invaders.

As nations race to cultivate powerful warriors and compete for dominance in the dangerous otherworldly realms, strength becomes the ultimate measure of status and survival.

Then, a legendary existence awakens.

After slumbering for a million years, the First King of the Dragon Kingdom finally returns to the world. During his unimaginably long period of dormancy, he accumulated vast resources, treasures, and power beyond mortal comprehension. The moment he reappears, the balance of the world begins to shift.

Monsters that once terrorized humanity tremble in fear.

Powerful bosses from countless dimensions become cautious.

Even the strongest Class Shifters, individuals revered as living legends, find themselves insignificant in the presence of a king whose strength has been accumulating for an entire million years.

As the world enters a new age of conflict and conquest, the ancient king steps forward once again, ready to reshape history and prove why his name once stood above all others.