Sisyphus is a Korean science fiction drama exclusively available on Netflix. It follows a successful tech entrepreneur called Han Tae-Sul and Gang Seo-Hae, a woman who travels back from the future to save him from assassination, and by extension, save South Korea from a nuclear attack.

How and why this is all supposed to work is a little hazy for most of the series, because the protagonists themselves, while convinced that their actions have the potential to save millions, do not entirely understand the mechanism by which this is going to happen. This is because they’re trying to change a future that they have only limited knowledge about.