The earth's air being too dangerous to survive in, people have been forced to live in an underground facility. But it's not as bad as it seems. With plenty of resources, life underground is somewhat normal.
Cryonically frozen people have been stored in the same building, being brought to life whenever the project is successful. Vivian is one of them. When she wakes up, she's introduced to a different life in this new future. But the thing is, she can't really remember anything from her past life....