Korean cinema has a long and rich history, and in recent years, Korean sci-fi films have been gaining increasing attention from international audiences. However, there are still many great Korean sci-fi movies that fly under the radar. Here are 10 of the most underrated Korean sci-fi movies of all time:

Sori: Voice from the Heart (2016)

Sori: Voice from the Heart is a South Korean sci-fi drama film directed by Lee Ho-jae. The film stars Kim Won-hae, Lee Ha-nee, and Dean Dawson.

The film tells the story of Hae-kwan (Kim Won-hae), a father who is searching for his missing daughter, So-ri (Lee Ha-nee). Hae-kwan is devastated when So-ri is declared dead in a subway fire. However, he refuses to give up hope and continues to search for her.

One day, Hae-kwan comes across a mysterious AI satellite robot that has crashed in the forest. The robot, named Sori, has the ability to remember sounds from all over the world. Hae-kwan realizes that Sori may be able to help him find his daughter.

Hae-kwan and Sori embark on a journey together, searching for So-ri's voice. Along the way, they form an unlikely bond and learn to trust each other.

Why should you watch Sori: Voice from the Heart?

There are many reasons why you should watch Sori: Voice from the Heart. Here are a few:

• It is a heartwarming and suspenseful story about a father's love for his daughter.

• It explores the themes of grief, loss, and hope.

• It features strong performances from the cast, especially Kim Won-hae and Lee Ha-nee.

• It is visually stunning, with beautiful cinematography and special effects.

• It is a thought-provoking film that will stay with you long after you watch it.

If you are looking for a thought-provoking and heartwarming film to watch, then I highly recommend Sori: Voice from the Heart. It is a film that will stay with you long after you watch it..

2009: Lost Memories (2002)

2009: Lost Memories is a South Korean science fiction action thriller film directed by Lee Shi-myeong. The film stars Dong-kun Jang, Takuya Kimura, and Koichi Sato.

The film is set in an alternate timeline where Japan won the Second World War and Korea is now a part of Japan. In 2009, a group of Korean freedom fighters attempt to travel back in time to prevent Japan from winning the war.

The film is a fast-paced and action-packed thriller that explores themes of history, identity, and redemption. It is a thought-provoking film that will make you question the nature of reality.

Why should you watch 2009: Lost Memories?

There are many reasons why you should watch 2009: Lost Memories. Here are a few:

• It is a unique and thought-provoking film that explores an alternate history of Korea.

• It is a well-made and suspenseful thriller with plenty of action.

• It features strong performances from the cast, especially Dong-kun Jang and Takuya Kimura.

• It is a visually stunning film with impressive special effects.

If you are a fan of science fiction, action, or historical thrillers, then I highly recommend 2009: Lost Memories. It is a film that will stay with you long after you watch it.

Lucid Dream (2017)

Lucid Dream is a South Korean science fiction thriller film directed by Kim Joon-sung. The film stars Go Soo, Sol Kyung-gu, and Kim Min-hee.

The film tells the story of Dae-ho (Go Soo), an investigative journalist who uses lucid dreaming to try to solve the case of his son's kidnapping. Lucid dreaming is a state of consciousness in which the dreamer is aware that they are dreaming.

Dae-ho's son was kidnapped three years ago, and the police have been unable to find him. Dae-ho believes that if he can lucid dream about the day of his son's kidnapping, he may be able to find clues that will lead to his son's whereabouts.

Dae-ho undergoes training to learn how to lucid dream, and he eventually succeeds in entering a lucid dream about the day of his son's kidnapping. However, he soon realizes that the dream is not what it seems.

Why should you watch Lucid Dream?

There are many reasons why you should watch Lucid Dream. Here are a few:

• It is a suspenseful and thought-provoking film that will keep you guessing until the very end.

• It explores the fascinating concept of lucid dreaming in a realistic and believable way.

• It features strong performances from the cast, especially Go Soo and Sol Kyung-gu.

• It is visually stunning, with beautiful cinematography and special effects.

If you are a fan of science fiction, thrillers, or mystery films, then I highly recommend Lucid Dream. It is a film that will stay with you long after you watch it.

Illang: The Wolf Brigade (2018)

Illang: The Wolf Brigade is a South Korean action thriller film directed by Kim Jee-woon. The film stars Kang Dong-won, Han Hyo-joo, and Jung Woo-sung.

The film is set in a dystopian future where South and North Korea have unified. However, the peace is fragile, and a terrorist group called the Illang is threatening to destabilize the country.

The Wolf Brigade is a special forces unit tasked with suppressing the Illang. The unit is made up of former soldiers from both North and South Korea, and they are trained to use extreme violence to achieve their goals.

The film follows the story of Yoon-hee (Han Hyo-joo), a young woman who joins the Wolf Brigade in order to avenge the death of her family. Yoon-hee soon finds herself caught up in a web of political intrigue and violence, and she must decide where her loyalties lie.

Why should you watch Illang: The Wolf Brigade?

There are many reasons why you should watch Illang: The Wolf Brigade. Here are a few:

• It is a stylish and action-packed thriller with great visuals.

• It explores themes of government control, individual freedom, and terrorism.

• It features strong performances from the cast, especially Kang Dong-won and Han Hyo-joo.

• It is a thought-provoking film that will stay with you long after you watch it.

If you are a fan of action, thrillers, or science fiction films, then I highly recommend Illang: The Wolf Brigade. It is a film that will stay with you long after you watch it.

Alienoid (2022)

Alienoid is a South Korean science fiction action film directed by Choi Dong-hoon. The film stars Kim Tae-ri, Kim Woo-bin, So Ji-sub, and Ryu Jun-yeol.

The film is set in the Joseon period, when a mysterious spaceship crash-lands in Seoul. The passengers of the spaceship are aliens who are being hunted by a government agency.

Meanwhile, a group of criminals are trying to steal a sword that is said to have the power to open a portal to another dimension. The two groups of characters cross paths, and they must work together to stop the government agency and prevent the aliens from opening the portal.

Why should you watch Alienoid?

There are many reasons why you should watch Alienoid. Here are a few:

• It is a visually stunning film with impressive special effects.

• It is an action-packed film with plenty of fight scenes.

• It features a star-studded cast, including Kim Tae-ri, Kim Woo-bin, So Ji-sub, and Ryu Jun-yeol.

• It is a thought-provoking film that explores themes of time travel, parallel universes, and the nature of reality.

If you are a fan of science fiction, action, or fantasy films, then I highly recommend Alienoid. It is a film that will keep you entertained from start to finish.

The Host (2006)

The Host is a South Korean monster movie directed by Bong Joon-ho. The film stars Song Kang-ho, Bae Doona, and Park Hae-il.

The film tells the story of a family who is trying to rescue their daughter from a mysterious creature that has emerged from the Han River. The creature is a cross between a fish and a frog, and it is incredibly strong and aggressive.

The family must band together to fight the creature and rescue their daughter. Along the way, they learn more about the creature and its origins.

Why should you watch The Host?

There are many reasons why you should watch The Host. Here are a few:

• It is a well-made and suspenseful monster movie.

• It features strong performances from the cast, especially Song Kang-ho and Bae Doona.

• It is a thought-provoking film that explores themes of family, responsibility, and the environment.

If you are a fan of monster movies, then I highly recommend The Host. It is a film that will keep you entertained from start to finish.

Memories of Murder (2003)

Memories of Murder is a South Korean mystery thriller film directed by Bong Joon-ho. The film stars Song Kang-ho, Kim Sang-kyung, and Kim Roe-ha.

The film is set in the 1980s, and it tells the story of two detectives who are investigating a series of murders of young women. The murders are particularly gruesome, and the detectives are under pressure to catch the killer.

The detectives are hampered by the lack of technology and resources, and they are also dealing with the political climate of the time. The film is a slow-burning but suspenseful thriller that explores the themes of violence, corruption, and the dark side of human nature.

Why should you watch Memories of Murder?

There are many reasons why you should watch Memories of Murder. Here are a few:

• It is a well-made and suspenseful mystery thriller.

• It features strong performances from the cast, especially Song Kang-ho.

• It is a thought-provoking film that explores complex themes.

• It is a historical film that provides a glimpse into South Korea in the 1980s.

If you are a fan of mystery thrillers, then I highly recommend Memories of Murder. It is a film that will keep you guessing until the very end.

The Good, the Bad, the Weird (2008)

The Good, the Bad, the Weird is a South Korean Western action comedy film directed by Kim Ji-woon. The film stars Song Kang-ho, Lee Byung-hun, and Jung Woo-sung.

The film is a tribute to the spaghetti Western genre, and it tells the story of three men who are all after a treasure map. The three men are:

• The Good: a bounty hunter named Tae-su (Song Kang-ho).

• The Bad: a train robber named Yoon Tae-goo (Lee Byung-hun).

• The Weird: a mysterious gunman named Park Do-won (Jung Woo-sung).

The three men race across the desert, each trying to get their hands on the treasure map. Along the way, they encounter a variety of obstacles, including bandits, bounty hunters, and even a group of Japanese soldiers.

Why should you watch The Good, the Bad, the Weird?

There are many reasons why you should watch The Good, the Bad, the Weird. Here are a few:

• It is a well-made and entertaining action comedy.

• It features strong performances from the cast, especially Song Kang-ho, Lee Byung-hun, and Jung Woo-sung.

• It is a visually stunning film with impressive action sequences.

• It is a fun and exciting film that will keep you entertained from start to finish.

If you are a fan of Westerns, action comedies, or Korean cinema, then I highly recommend The Good, the Bad, the Weird. It is a film that will stay with you long after you watch it.

A Tale of Two Sisters (2003)

A Tale of Two Sisters (2003) is a South Korean psychological horror film directed by Kim Jee-woon. The film follows two sisters who return home from a mental hospital and begin to suspect that their stepmother is not who she seems. The film is a complex and suspenseful exploration of grief, guilt, and the power of the human mind.

The film begins with the two sisters, Su-mi (Yum Jung-ah) and Su-yeon (Im Soo-jung), being released from a mental hospital. They return home to their father (Moon Geun-young), who has remarried Eun-joo (Kim Kap-soo). The sisters are immediately suspicious of Eun-joo, and they soon begin to experience strange and disturbing events.

As the film progresses, the sisters' suspicions are confirmed. Eun-joo is not who she seems, and she is responsible for the strange events that have been happening. However, the sisters' own mental state is also called into question, and it becomes unclear what is real and what is not.

A Tale of Two Sisters is a masterfully crafted film that defies easy categorization. It is a psychological horror film, but it is also a family drama, a mystery, and a thriller. The film is beautifully shot and directed, and the performances by the cast are all excellent.

The film is also notable for its ambiguous ending. The film leaves many questions unanswered, which has led to much debate and discussion among fans. This ambiguity is part of what makes the film so effective, as it allows the viewer to come to their own conclusions about what happened.

If you are a fan of psychological horror films, then A Tale of Two Sisters is a must-watch. It is a complex and suspenseful film that will stay with you long after you have seen it.

Here are some of the reasons why you should watch A Tale of Two Sisters:

• The film is beautifully shot and directed.

• The performances by the cast are all excellent.

• The film is a complex and suspenseful exploration of grief, guilt, and the power of the human mind.

• The film has an ambiguous ending that will leave you thinking.

• The film is a classic of Korean horror cinema.

If you are looking for a truly disturbing and thought-provoking horror film, then A Tale of Two Sisters is the perfect choice for you.

Oldboy (2003)

Oldboy is a 2003 South Korean mystery thriller film directed by Park Chan-wook, based on the Japanese manga of the same name by Nobuaki Minegishi and Garon Tsuchiya. The film stars Choi Min-sik as Oh Dae-su, a man who is kidnapped and imprisoned for 15 years without knowing why. He is then released and given 5 days to find his captor, or he will be killed.

The film is a dark and twisted tale of revenge, but it is also a meditation on the nature of memory, identity, and redemption. It is a visually stunning film with some unforgettable scenes, including the infamous "octopus scene".

Why should you watch Oldboy? If you are a fan of mystery thrillers, then you will definitely want to check this film out. It is a well-made and suspenseful film with a twist that will leave you reeling. However, be warned that the film is also very violent and disturbing, so it is not for the faint of heart.

Here are some of the things that make Oldboy a great film:

• The story is complex and intriguing, with plenty of twists and turns to keep you guessing.

• The characters are well-developed and believable, even the ones who are morally ambiguous.

• The acting is superb, especially from Choi Min-sik, who gives a tour-de-force performance.

• The cinematography is beautiful and stylish, with some truly memorable images.

• The film is violent and disturbing, but it is also thought-provoking and emotionally resonant.

If you are looking for a challenging and rewarding film experience, then Oldboy is definitely worth watching. It is a film that will stay with you long after you have seen it.

These are just a few of the many great Korean sci-fi movies that are worth checking out. If you're a fan of the genre, be sure to add these films to your watchlist.

Why should you watch these movies?

There are many reasons why you should watch these movies. Here are a few:

• They are well-made and suspenseful.

• They explore interesting and thought-provoking themes.

• They feature talented actors and actresses.

• They are visually stunning.

• They are a great way to expand your horizons and experience different cultures.