In the shadow of the ice giant at the edge of the solar system, suspended is the miraculous city "Newcastle" powered by gears and steam magic. The timid and cautious cultural relic restorer Lu Jinyan repairs ancient machinery day after day, and at night he sneaks into other people's dreams to look for clues. Until he discovered that residents were "geared" every month - their bodies were replaced by machines, and their memories were quietly tampered with. The city itself seems to have breathing and heartbeat. When his colleague Ye Qingci's family's thousand-year-old secrets are awakened by the sound of gears turning, and when the hypocritical mask of the Chief of Public Security melts in the steam, Lu Jinyan must use his only ability - to deduce the consequences of every choice - to find the almost non-existent way out between becoming a living part, sacrificing a loved one, or awakening a sleeping ancient god.
