Within the high walls is a cyber city with strict order; outside the high walls is a forbidden wasteland where the iron-eating worms are raging.
Zhang Yuan is a voiceless person living at the bottom of Rusty Alley. His only "talent" is the ability to hear subtle sounds that ordinary people cannot detect. When his dependent sister contracted a strange disease, and his only hope was to break into the inner city to obtain the sky-high price of the antidote, he was forced to embark on the bloody journey of selection for the awakened ones.
However, the iron-eating insects that should not exist in the wall appeared in the selection passage, the mysterious metal fragments entrusted to the old scavenger before his death, the strange hissing echoing in the sister's dream, and the hot necklace left behind by her parents before they disappeared... All clues point to a buried truth: the foundation of the high wall is being silently eroded, and the so-called shelter may have been riddled with holes.
In this apocalyptic world where steel and flesh are intertwined, Zhang Yuan must use his only "voice" to carve out a way out for himself and his loved ones amid the endless conspiracies and insect waves.
