Li Fan is a top university student living a quiet life in Chang'an, supported by the inheritance of his adoptive parents. His world is shattered when he experiences a vivid, apocalyptic vision that he initially dismisses as a nightmare. In this dream, he leads a survivor squad in a post-apocalyptic wasteland plagued by zombies and otherworldly beasts. Despite his efforts to protect his comrades, they are betrayed by a traitor within their ranks and hunted by the Yanjing Inner City military, led by Li Yuhang, the son of a powerful political figure. Li Fan's beloved companions, Xu Jianguo and Fan Youyou, die in a desperate last stand. Betrayed by Yuan Ruoxue, the woman he trusted most, Li Fan is forced to swallow a mysterious artifact known as the Fire Seed before leaping into the Arctic Abyss to escape capture.
Li Fan awakens in his university classroom, realizing he has traveled back in time to three days before the apocalypse begins. The sky turns a ominous crimson, confirming that the disaster he witnessed was not a dream but a future event. Determined to survive and change his fate, Li Fan decides to abandon his previous compassionate nature and prepare for the coming catastrophe. He liquidates his assets and tricks Xie Debiao, a local crime boss who had tormented him in his past life, into lending him eighty million yuan by using his properties as collateral. With the funds, Li Fan commissions the construction of a heavily fortified underground fortress equipped with insulation, independent power systems, and water supply from an underground vein.
Li Fan systematically stocks up on essential supplies, purchasing vast quantities of food, clothing, medicine, and weapons from various suppliers. He also takes drastic measures to eliminate immediate threats, orchestrating an arson attack on an illegal underground casino run by Xie Debiao's associates to remove his tail and disrupt his enemy's operations. As the days pass, the temperature fluctuates wildly, signaling the onset of the solar reignition phase that will trigger the global disaster. Li Fan warns his close friend Kou Peng to stay indoors and stock up on supplies, though Kou Peng initially doubts his seriousness. The story follows Li Fan's meticulous preparations as he readies himself for the impending collapse of civilization, armed with foreknowledge of the events to come and a resolve to survive at any cost.
