Qiao Tiedou, a young practitioner of the intangible cultural heritage art of molten iron fireworks, joins forces with Lu Xiaolu, a Beidou satellite navigation algorithm engineer. Under the guidance of their mentor, Cheng Damao, they combine the traditional craft of molten iron fireworks with Beidou satellite technology. A sudden energy chamber meltdown crisis erupts at the National Digital Intangible Cultural Heritage Laboratory. The two must learn to work together, blending tactile craftsmanship with data, as they tackle a holographic Great Wall arena, field trials at a Gobi Desert wind farm, and a joint technology team representing seventeen countries. Carrying forward their ancestors' legacy of aerospace engineering and molten iron fireworks, they use iron sparks as fire and data as thread to weave a Chinese knot and triumph in the final showdown.