The Great Flood: Release date news, cast details, streaming details and more about the upcoming Korean sci-fi disaster film

When Korean cinema takes on disaster, one can expect large scale realism ties with an emotional premise and a stellar cast; and Kim Byung-woo's The Great Flood (대홍수) is shaping up to be exactly that. At it's core, the story follows catastrophic flood swallowing the world, centering on survivors trapped inside a drowning apartment complex.

The official synopsis of the film reads,

"When a raging flood traps a researcher and her young son, a call to a crucial mission puts their escape — and the future of humanity — on the line."

With complex characters and a compelling narrative, the film is shaping up to be one of the most talked about releases of the year. Here's everything you need to know about The Great Flood.

When will The Great Flood release?

Still from The Great Flood (Image via Netflix)

The film is set to premiere on the big screen first at the 30th Busan International Film Festival, under the Korean Cinema Today- Special Premiere section on September 18th, 2025. After that, it will be available to stream on Netflix from December 18, 2025.

Cast and characters in The Great Flood

The film is being led by Kim Da-mi as Anna, an AI researcher who is trying to outthink the flood and is trying to protect lives. She is joined by Park Hae-soo as Hee-jo, and Kim Kyu-na, Kim Byung-nam, Lee Dong-chan, and Kim Su-kyung.

More details about The Great Flood

Directed by Kim Byung-Woo, who worked on the script with Han Ji-Su, the film marks the much awaited return of Kim Da-Mi in the lead role. The story starts with how an ordinary morning between her and her son Ja-In shatters as floodwater swallows their world. Their desperate fight for life unfolds in a sinking apartment building, where every rising inch of water tightens the grip of suspense.

Park Hae-Soo joins the cast as Hee-Jo, a mysterious member of a security team who is on a hidden mission. But his arrival complicates things as Anna has to balance her sacrifice, survival and her love for her son, all at once.

The film was shot over six months between July 2022 and January 2023, capturing both the grand scale of a planet-ending flood and the intimate human struggles inside it. The teaser shows extraordinary visuals: a rooftop standoff, a rocket bound for space and golden fragments that hint at mysteries far beyond Earth.

With Kim Byung-Woo's meticulous storytelling and powerhouse performances from the cast, The Great Flood promises to be a haunting reflection of human sacrifices, environmental panic and the fight to survive when the world is ending.