In her past life, Anna was betrayed and murdered in an extreme-heat apocalypse by her stepmother Evelyn, her sister Chloe, and her fiancé Brad. Unexpectedly reborn three days before the apocalypse strikes, Anna is determined to take revenge. She decisively sells off her company shares for cash, uses a magical spatial ring with absolute preservation abilities to frantically stockpile massive supplies and weapons, and upgrades her villa into an impregnable fortress. The extreme-heat apocalypse arrives as expected. While the traitors who betrayed her lose their dignity and struggle in the heat and hunger, Anna enjoys air conditioning and gourmet food in her safe house. During this time, she meets Gabriel, heir to a top tycoon, and the two join forces to repel vicious neighbors and enemies trying to seize their supplies. Later, a deadly virus sweeps the apocalyptic world, and Brad—also reborn—attempts to establish dominance and take revenge on Anna using a flawed, half-finished vaccine. Anna, however, saves Dr. Paige in advance and successfully develops a true vaccine, completely crushing Brad's scheme. In the end, the villains turn on each other in despair and infighting, and all are brought to justice. With her revenge complete, Anna and Gabriel confess their feelings and embark together on a new path of survival in the apocalypse.
