On a stormy night, food delivery boy Lin Beichen awakens the power to control metal and is forced to enter Lingxiao Academy, where dragonkin are trained. When he discovers that forbidden Yinglong blood flows through his veins, and that the spine of a girl from the mechanical arts department is actually a compass sealing a dragon servant, a thousand-year conspiracy comes crashing into view: the modern city is an altar for resurrecting ancient gods, and every hybrid is a living sacrifice marked with a countdown.
