When the extreme heat doomsday descends, Jiang Wantang carries a system space and is reborn three days before the disaster breaks out. She decisively cuts off the bonds from her past life, takes back seven million funds from her father, frantically hoards supplies, reinforces her safe house, and rejects all moral kidnapping and family extortion. Her fiancé, younger sister, and father, who betrayed her in her past life, repeatedly set up schemes to seize her space and supplies, all of which are beaten back by her with iron-blooded means. Meanwhile, Pei Yanchuan, a mysterious man bearing the inheritance rights of an energy base, reaches an alliance with her, and the two join forces to fend off the shocks from external forces and community mobsters.