Netflix has added South Korean sci-fi thriller The Great Flood to its library, starring Squid Game's Park Hae-soo and Kim Da-mi. The film follows AI researcher An-na (Kim Da-mi) and her son Ja-in as they survive a catastrophic flood caused by an asteroid strike on Antarctica. The disaster melts polar ice, submerging half of Japan and threatening South Korea.
An-na works at the Darwin Centre, an organisation dedicated to preventing human extinction. She oversees the Emotion Engine, a technology that gives synthetic humans genuine emotions. It is revealed that Ja-in is actually a synthetic human raised by An-na for five years to develop authentic feelings through real experiences.
When officials forcibly remove Ja-in to harvest his memories for the Emotion Engine, An-na devises a time loop experiment. She proposes that a synthetic mother must repeatedly experience the flood scenario, trying to reunite with her son. If she fails, the loop resets, but humanity faces extinction if she never succeeds.
An-na dies during a journey to a space facility, but her memories are transferred into a synthetic version of herself. This synthetic An-na relives the same day 21,499 times over 58 years. Finally, she finds Ja-in hiding in a wardrobe, as she had taught him. The experiment ends, offering hope for humanity's survival.
In the final scene, An-na and Ja-in awaken on a shuttle returning to Earth. The planet is not destroyed; Africa appears green, and multiple other shuttles descend, suggesting survivors.
