Signal

There are those who are born monsters, but there are also those who are made into monsters by people.

A cold-case detective receives mysterious radio transmissions from an investigator in the past, bridging two eras to unearth forgotten murders and hunt serial killers whose crimes have long gone unpunished. Together, they navigate decades of dormant cases where the dead demand answers and every broadcast brings them closer to a truth that transcends time itself. A supernatural thriller where communication becomes salvation.