Native Title	대홍수
Also Know as	Daehongsu
Director	Kim Byung-Woo
Writer	Kim Byung-Woo
Distributor	Netflix
Air Time	Friday
Content Rating	15+ - Teens 15 or older
Runtime	1 hour 46 minutes
Genre	Action, Adventure, Drama, Sci-Fi
Language	Korean
Country	South Korea
Release Date	2025-12-19

“The Great Flood” (Korean: 대홍수) is a South Korean a sci-fi disaster thriller, which had its world premiere at the 30th Busan International Film Festival on September 18, 2025, followed by its global online debut on Netflix on December 19, 2025.

Directed by the acclaimed Kim Byung-woo and produced as a Netflix original, it falls under the science fiction disaster genre, exploring the fragility of human existence in a world on the brink of extinction.

Plot Overview

In a world ravaged by an unprecedented catastrophe, “The Great Flood” unfolds on what could be Earth's final day. A massive tsunami engulfs the planet, submerging entire cities and trapping survivors in a desperate bid for life. The story centers on the inhabitants of a sinking apartment building, where the line between salvation and doom blurs.

Key characters An Na, an AI development researcher, and Hee Jo, head of a human resource security team, fight to endure the rising waters. Hee Jo's mission to rescue An Na raises intriguing questions: Why is he so determined to save her specifically, and what hidden forces are at play?

As the floodwaters rise, the narrative shifts to a high-stakes struggle to protect a child amid the chaos, forcing characters to confront moral dilemmas and the essence of survival. The teaser poster evocatively captures this tension, showing an adult and child embracing underwater in a submerged high-rise, lit by faint rays piercing the depths. The tagline – "The last day on Earth, The one choice for survival" – hints at profound choices that could redefine humanity's legacy.

Cast & Characters

The film boasts a powerhouse duo in its leads, marking another strong collaboration in Korean cinema's rising stars.

Kim Da-mi as An Na: A brilliant AI researcher trapped in the flood. Her character's expertise in artificial intelligence adds a futuristic layer to the survival narrative.
Park Hae-soo as Hee Jo: A determined security team leader tasked with rescuing An Na.

Reception

Critics' Reviews

Early news coverage of “The Great Flood” has generated positive buzz, praising the star-studded cast and director's vision.

Fan Reviews

Fan discussions are just beginning, with many excited about the blend of disaster spectacle and sci-fi intrigue.

Rating Expectations

Post-release, expect it to climb rankings quickly, given Netflix's track record with Korean originals like “Squid Game” and “All of Us Are Dead”.

Fun Facts & Highlights

Director's Signature Style

Kim Byung-woo is a master of confined-space thrillers – think the high-tension newsroom of “The Terror Live” or the tactical ops in “Take Point”. “The Great Flood” continues this trend with its claustrophobic apartment setting, amplified by underwater visuals.

Director Kim Byung-woo emphasizes that the film transcends mere disaster tropes*: "This film does not end with disaster. My initial idea was, 'Let's begin a story that could be complex or simple through the genre of disaster.'"

* Early reports suggested elements of a time loop, but the confirmed storyline leans into emotional, real-time peril.

Casting Journey

Kim Da-mi was the first confirmed lead in June 2022, with her agency ANDMARQ noting she was "positively considering" the offer. Park Hae-soo joined shortly after in August 2022, solidifying the film's star power.

Apocalyptic Teaser Vibes

The poster's submerged apartment evokes classics like "The Poseidon Adventure" but with a modern K-film twist, emphasizing human bonds over spectacle.

Netflix Exclusivity

As an original, it's tailored for global audiences, potentially breaking language barriers with subtitles in multiple languages.

Thematic Depth

Beyond floods, the story probes AI's role in humanity's fate, tying into An Na's profession and broader existential questions.

Final Thoughts

“The Great Flood” arrives at a poignant time, mirroring real-world anxieties about climate disasters while delivering escapist thrills through stellar performances and innovative storytelling. With Kim Da-mi and Park Hae-soo's emotional depth anchoring the chaos, and Kim Byung-woo's direction promising more than meets the eye, this could be one of Netflix's standout K-movies of 2025. If you love survival epics with a sci-fi edge, mark your calendars – it's set to make waves.

Where to Watch

Exclusively on Netflix with a subscription. The film premieres worldwide on December 19, 2025, following its festival screening on September 18, 2025.

Main Role

Kim Da-Mi

Park Hae-Soo

Support Role

Kang Bin

Guest Role

Lee Jae-Woong

Unknown Role

Jung Shi-Hoon

Kim Kyu-Na

Gallery

https://media.hanbuzz.com/2025/09/17133742/The-Great-Flood-2025-6-691x1024.jpg

https://media.hanbuzz.com/2025/09/17133741/The-Great-Flood-2025-7-691x1024.jpg