Strange things have been happening in Wucheng recently. The remains of many missing persons were not found, but their families received distress signals from second-hand radios at the flea market.
Mi Chen runs a "Chen Yin Repair Shop" that is on the verge of bankruptcy. He doesn't repair appliances, only radios that "talk". Yan Qing, captain of the criminal investigation detachment, forcibly intervened in the investigation and mistakenly believed that Mi Chen was a perverted killer. However, after witnessing him capturing the death scene of the deceased through a knob, he was forced to cooperate with him.
The first case is "Rainy Night Bus". An old-fashioned bus that had fallen into the sea for many years suddenly appeared on the city's main road, and the radio in the car played the screams of that year on a loop. Mi Chen discovered that what was hidden in these radios was not ghosts, but an alien consciousness called "parasitic frequency". They were devouring human memories and trying to materialize them.
As the investigation deepened, Mi Chen discovered that her sister chose to sacrifice herself and upload her consciousness into the radio tower just to prevent the intrusion of these frequencies.
However, the real twist is: Mi Chen is not human. He is the product of the combination of the first generation of "frequency" and humans, and is the only key that can close the passage between the two worlds. In the end, he must make a choice between destroying the fog city to save mankind, and rescuing his sister trapped in the radio waves...
