After the world was swept by a terrifying heat wave, the world fell into a sea of fire and chaos, and the protagonist died in endless despair. However, the gears of fate turned quietly, and the protagonist was miraculously reborn. When he woke up, he found himself back before the heat wave disaster. This time, he is determined to change everything. With the memory of future disasters, the protagonist rises against the flow of time. He searched for information in libraries and worked with scientists to find ways to stop heat waves. At the same time, he also has to fight against those who do not understand or even sabotage his actions. Under many difficulties, can he rewrite the fate of mankind being destroyed by heat waves and become the last light of hope for mankind?