In her previous life, An Nan was betrayed and harmed by her boyfriend, dying tragically amid extreme heat. Fortunately, she is given a chance to be reborn. She begins making preparations in advance, exchanging properties, handling her patents, and stockpiling ample supplies so she can calmly face the coming extreme-heat apocalypse. She meets Gu Zhiyu, who showed her kindness in her previous life, and discovers that he has also made thorough preparations. After the apocalypse arrives, they support one another and work together, making those with malicious intentions pay for the consequences of their own actions. As they overcome one challenge after another, they gradually fall in love and build a secure refuge together, standing by each other's side as they bravely face the many trials of the post-apocalyptic world.