In ancient times, spiritual energy declined, and human races and alien races fought endlessly. Bai Mu is the only heavenly spirit in the human race. He was originally expected to destroy the alien race. However, the spiritual energy continued to dry up. Da Siming deduced that the spiritual energy would be revived in the future, so he sealed Bai Mu into the depths of the Changbai Mountain Tianchi with the last destiny magic. After a long time, mankind entered the era of mechas and urban technology. The spiritual energy tide returned, the seal loosened, and Bai Mu woke up in the ice lake. He mistook the mecha as a cast-iron demon puppet, mistook the intelligent system as a sorcery of sound transmission, and mistook the vending machine as a sacred artifact, causing a series of jokes. But under the laughter, the shadow of Tianchi, the subway monster dream, the controlled mecha and the faceless pedestrian appeared one after another, and the demons and mysteries were also awakening. The human race's territory retreated again and again, and Changbai Shucheng became the first crack. From being an incompatible Frozen One at first, Bai Mu gradually realized that humans in this era have never given up resistance: they use steel to make armor and the fire of their hearts as blades. He formed a special armor division with reserve mecha pilot Ling Zhaoxue, maintenance genius Ding Jiuru, cold commander Jiang Tingyun and others to find a way to break the situation between ancient inheritance and modern technology, and successively fought against the demon pioneer Red Demon, the awakened alien noble Qi Yu, the mysterious lord Wu Xianghou, and the alienated person Shen Zhuo hidden in the upper echelons of mankind. The story will expand from Changbai City to the entire human defense line, uncovering the truth about the revival of spiritual energy, ancient seals and alien origins, and finally sounding the clarion call for a comprehensive counterattack by the human race.