When a mountain-dwelling little demon devoted to seeking immortality falls into an apocalypse riddled with danger, Gu Yu travels across the wasteland in search of spiritual energy, diligently cultivating in the hope of one day attaining the Great Dao. That is, until she meets Shang Mo, a special forces captain whose immense store of karmic merit deeply attracts her. Naturally clingy and affectionate, the little demon loves snuggling up beside him and coquettishly seeking his affection. In the desolate apocalypse, with smoke and gunfire everywhere, the cold and tough Shang Mo shelters this innocent little demon beneath his protective wings, giving her all his love and special treatment.