Imagine waking up one morning in one of the safest, richest neighborhoods in South Korea, and hearing that an elderly couple was found beaten to death inside their own home.

No robbery.

No break-in.

No clear motive.

Just blood everywhere.

Then it happens again.

And again.

And again.

At first, police thought maybe these were isolated murders. But eventually they realized something horrifying. Someone was hunting people. Not just killing them… hunting them.