Reborn: My Apocalypse Shelter

In her past life, Shen Han Shuang was tricked out of her penthouse by fiancé Leo Hale and his mother, dying in the apocalypse's extreme heat. Reborn thirty days before doomsday, she trades the penthouse for an abandoned underground cold storage, transforming it into an indestructible fortress. When the heat arrives, the penthouse becomes a 'solar oven,' tormenting Leo Hale and his mother. Leo attempts to breach the fortress but dies. Her revenge is complete.