In the wake of a global cataclysm that has erased daylight and unleashed unspeakable entities into the night, a brilliant but isolated mechanical genius named Lin Xian survives by turning his knowledge into salvation. With no faith in humanity’s remnants, he dedicates himself to a radical plan: converting a massive, abandoned gas turbine locomotive into the core of an endless, self-sustaining train that can outlast the apocalypse. Using a unique ability called 'Mechanical Heart'—which lets him scan, repair, and power machines with his own energy—he transforms freight cars into mobile shelters and scavenges the ruins for parts.

As he prepares for his first journey, he encounters eerie phenomena: helicopters vanish in unnatural clouds, survivors whisper of impossible beings, and something knocks on his reinforced door in the dead of night. With dawn fading forever and the world becoming a labyrinth of darkness and horror, Lin Xian’s train may be the last hope—not just for escape, but for rebirth.