2077 AD: Frozen Earth

When Earth's temperature crashes to -80°C, humanity's last hope lies beneath the frozen wasteland. In 2077, survivors cling to life in underground sanctuaries while legendary AI guardians—Xuanwu, Phoenix, Tianlong, and Baihu—brave the deadly surface to gather resources. Tech expert Ling Yichen maintains the fragile systems keeping thousands alive, while biologist Li Nianyan fights to resurrect a dying world. But the greatest threat isn't the ice above—it's the darkness within. As resources dwindle, the underground becomes a powder keg of betrayal, power plays, and desperate survival.