Humanity's future on planet Earth rests in the hands of unsuspecting heroes in writer-director Kim Byung-woo's sci-fi disaster blockbuster. Artificial intelligence researcher An-na (Kim Da-mi) and her young son Ja-in (Kwon Eun-seong) wake on an ordinary morning, blissfully unaware their lives are about to change forever. A record-breaking great flood races towards An-na's apartment building and as rain continues to fall, the floodwaters rise, forcing mother and child to seek sanctuary on upper floors of the building. An-na must eventually make an impossible decision but security team operative Hee-jo (Park Hae-soo) may hold the key to her future as the leader of a mysterious mission that could take the last fragments of humanity into space