A modern doctor transmigrates into the body of Tuoba Xue, a young Xianbei girl. Ambushed at a sacrificial banquet, she is transformed into a golden-spotted caterpillar. As her consciousness is about to be devoured by a butterfly gu, she unexpectedly gains the power to resonate with swarms of insects and leads fireflies and army ants in a desperate fight for survival. In a subterranean gu nest beneath the capital, a secret pact made a century ago to guard a spirit stone comes to light. From frail as an ant to wielding mysterious powers, watch as she uncovers a conspiracy and turns her fate around amid strange transformations!
