Ruthless King [Test Release]

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Cain is ruthless by nature—calm, controlled, and unflinching when dealing with anyone he considers an enemy. Violence doesn’t shake him; guilt doesn’t reach him. But beneath that cold exterior, he still protects the few people he claims as family. For them, he shows a loyalty and warmth he denies the rest of the world.

The Unknown Man who raised Cain wanted to force both worlds to connect, breaking the barrier so any demon-like creature could cross into the human world and bring chaos. His goal was simple—use that chaos to take control and rule over everything, with both worlds at his fingertips.

Cain carried a special bloodline, something rare and dangerous, giving him the potential to break the world’s natural power limit and reach endless strength. The Unknown Man intended to use Cain as the key to achieving his plan.

As the years passed, demons and monsters began appearing more often. The cracks between realms widened, and these creatures learned to possess humans, mixing into society and walking among people without being noticed.

Humanity didn’t realize it yet,
but the two worlds were already beginning to merge.