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Villain Overview

Gwoemul (in Korean: 괴물, lit: "Monster") is the titular main antagonist of the 2006 South Korean monster film of the same name (released internationally as The Host). It is a mutated fish-like creature created out of dumped formaldehyde and after attacking the people on the surface, it is believed to be a host for an extremely contagious virus.

Its vocal sound effects were provided by Oh Dal-su.



In late 2000, an American military pathologist orders his Korean assistant into dumping 200 bottles of liquid formaldehyde down a drain from a chemical lab leading to the Han River near Seoul. This dumping caused something within the sewers to mutate into a hybrid from drinking the formaldehyde. Over the years, there are numerous sightings of a strange amphibious creature in the water, fish in the river begin dying off, and a suicidal man spots something moving in the water before jumping from a bridge. His body is later discovered bitten in half.

First Contact

Gwoemul would make its first public appearance in October 2006, where numerous citizens witness the creature hanging underneath a bridge before diving into the water. It swims in front of the group, idling observing them from underneath the water. The snack bar salesman named Park Gang-do tosses one of his soda cans at the figure, which it eats almost instantly. The group toss more cans into the river for the thing to eat, only for it to swim away. Unfortunately, they end up aggravating the treacherous creature, which emerges from the river and runs loose through the city, eating several people whole and injuring many others.

While most of the witnesses flee from Gwoemul's frenzy, Gang-du and the others attempt to fight back against the creature, but only manage to make it angrier. Gang-du soon spots his daughter Hyun-seo in the crowd and grabs her, but only after tripping does he realize that he grabbed a different girl, before witnessing Gwoemul grab Hyun-seo with its tail and dive back into the river. After a mass funeral for the victims claimed by Gwoemul's rampage, American military officers quarantine Gang-du, his family, and others who came in contact with the monster into a hospital, as Gwoemul is believed to be a host to an unknown lethal virus.

Hunting the Park Family

Meanwhile, after killing two chemical scientists observing the bridge, Gwoemul regurgitates several of its victims into a small sewer pit to consume them later, including Hyun-seo, who hides from Gwoemul's sight within a small pipe opening. Gang-du, learning that his daughter is still alive via a phone call, escapes from the hospital with his father and siblings, Nam-il and Nam-joo, to track the monster's location through the call. Two homeless brothers are attacked by Gwoemul that night and Hyun-seo helps the only regurgitated survivor by the name of Se-joo into the pipe with her.

After failing to find the pit nor the beast within the sewers, the family then discover Gwoemul wandering about the next morning from within their trailer shelter, drinking the pouring rain. Hee-bong shoots at it, only to aggregate it enough to tip the entire trailer on its side. After a failed attempt to kill the monster, Hee-bong allows himself to be killed by Gwoemul to let his children safely escape, with the monster slamming his body against the pavement before retreating into the Han River.

Tracking Down the Creature

The siblings are separated due to the military discovering their presence in the restricted area, where Gang-du is taken back to the hospital against his will; everyone believes he has lost his mind despite his pleads that his daughter is still alive. While Nam-il goes out to find someone to help him trace Hyun-seo's phone through her call, Nam-joo finds a large section underneath the bridge leading to the sewers and calls Gang-du on Hyun-seo's possible whereabouts, only for Gwoemul to spot and push her into a storm drain. As the scientists prepare to surgically lobotomize Gang-du in order to silence him, he eavesdrops some scientists discussing that there was no virus, only a rumor made up to hide Gwoemul's origins to the public. After taking one of the nurses hostage, Gang-du is able to escape the hospital.

Outsmarting its Escapees

Back in the sewers, as Gwoemul vomits out the skeletal remains of its prey and swallows up fresh ones, it attacks Hyun-seo and Se-joo when the latter starts to cry from hunger. However, it is unable to reach them through the pipe and eventually gives up. Later, as the creature rests, the two kids make a rope out of clothing from the devoured victims to escape from the hole, using Gwoemul's tail as a boost. But as soon as Hyun-seo grabs the rope, Gwoemul pulls her down with its tail, making them realize too late that the creature faked its sleep to lure them out of their hiding spot. The two are then swallowed whole by Gwoemul before they are able to retreat in the pipe.

Around the same time, military personnel announce their plan to dump a toxic chemical known as Agent Yellow into the river in an attempt to kill the creature. Gang-du runs through the sewer and locates Gwoemul's hiding spot, only for it to be empty. While climbing down the clothing rope, he spots the monster passing above him with Hyun-seo's arm hanging outside its mouth and gives chase, stopping Nam-joo, who managed to climb out of the storm drain, from firing an arrow at it when it runs past her, fearing she may hit Hyun-seo. The two then chase after Gwoemul to the other side of the river, where a protest is occurring from the army preparing to dump Agent Yellow into the river. Gang-du immediately jumps into the water after the creature, leaving Nam-joo without a plan of how to save Hyun-seo as Nam-ill and a homeless man he befriended arrive.

Final Stand and Demise

Once Gwoemul makes it to the shore and begins attacking the crowd, the army open up the container with Agent Yellow inside, covering Gwoemul and the crowd. As Gwoemul collapses in a paralyzed state and the crowd flees in panic, Gang-du rushes over to the scene and pulls Hyun-seo out from Gwoemul's mouth, still clutching on to Se-joo. While Se-joo is still alive, Hyun-seo has already perished protecting him.

Enraged by his daughter's death, Gang-du attacks the creature when it awakens and slashes it with a metal pole from a biohazard sign, but is quickly knocked to the ground. Nam-il comes to his brother's aid by throwing Molotov cocktails at the creature while the homeless man pours gasoline on it, which Gwoemul drinks. As it drinks, Nam-il accidentally drops his last cocktail bottle, in which Nam-joo sticks the piece of cloth from the bottle onto an arrow and fires it straight into one of Gwoemul's eye, setting it ablaze from the gasoline. Before it is able to escape into the water, Gang-du impales Gwoemul through the mouth with the pole, finally killing the monster and ending its suffering.

Gang-du latter adopts Se-joo. The two live in his food stand, and he still watches over the river with a double-barrel shotgun to prevent any more of the mutated creatures like the Gwoemul to rise to the surface and terrorize people again.


Similarly to a fish, Gwoemul breathes oxygen through gills located behind its mouth, although it is able to move on land. Because of this, Gwoemul adapts more towards living in water, as it can swim quite fast even when holding something, while on land it often stumbles as it walks. It can climb and move around well above the ground thanks to stability from its tail, which it can also use to grab prey in a hurry.

It traps humans in its mouth and regurgitates their bodies out into a moist enclosed area to consume them later or just to trap them and leave them to die from injuries or starvation, in the film's case, a deep sewer pit only it can climb out of. It also uses its tongue to lick on the regurgitated bodies to check their pulse, finishing off anyone who moves. After its prey is fully consumed, it vomits out their bones, or anything else hard or metallic, as it is apparently unable to decompose anything but organic flesh. It bleeds out black goo when injured.


Gwoemul has a gray tadpole-like design with a segmented jaw that can open in mandibles surrounded in teeth, along with gills, two eyes (with a massive overgrowth along its right eye), a long whip-like tongue that it tucks inside the opening of its mouth, two rows of fins on its tail, and feet with two short arms located directly behind them. It also has four fin-like appendages located where its hind legs should be, although it does not need to use them as it can stabilize itself with its forelimbs.

Gwoemul's most noticeable features are the three fish stuck on its back to show its mutational side. During the climax, the fish fall out of the creature due to the Agent Yellow chemical and one is shown flopping on land; this means, by judging its mutated appearance, appears to have suffered the same mutated fate as Gwoemul and attached itself to a larger mutated organism and survived by either receiving nutrients from the source or slowly eating away at the host. Some of these fish are also seen in Gwoemul's sewer pit eating the bodies left by Gwoemul.


Gwoemul is an extremely dangerous creature that behaves like a feral animal, using its sheer power to hunt humans near the river, bringing them back to its lair in the sewers alive or not to feast on their bodies. While portrayed as a non-sapient predator, Gwoemul has enough intelligence to outsmart anything it considers prey. Quite possibly the most cunning trick that it does is to feign its sleep, so that it can ambush and finish off any captured prey that turned out to be still alive when brought to its lair.

However, despite its sadistic tendencies to inflict mayhem on humanity, Gwoemul can be seen as a troubled animal mutated in result of man's actions against nature and is driven to kill only to avenge its suffering. All of its actions have been caused not by malevolence but by regular instinct, therefore it is unable to feel emotion for any of its actions.

Gwoemul is also shown to have a bizarre and unorthodox habit. Whenever it senses liquid splashing around it in the form of rain (whether or not the liquid actually is water), it will tilt its head back and catch the liquid in its mouth, gulping it down single-mindedly. In one instance the liquid was gasoline, but it continued to perform this strange ritual. Why it followed such an odd ritual may relate to the dumped formaldehyde that was completely responsible for its mutation; though unconfirmed, it is possible that when it was either a fish or tadpole, it drank the dumped chemical and upon realizing its effect, it became addicted with the said liquid and lost its focus on another. This strange habit proved to be its downfall, as the gasoline it consumes eventually set it on fire by the protagonists before being impaled to put it out of its misery.

Powers and Abilities

Due to the formaldehyde mixed into its body, Gwoemul obtained multiple abilities to enhance it into a strategic apex predator:

  • Physical strength: Although being a hybrid of a fish or amphibian (which normally cannot place more force against objects that overdue its mass), Gwoemul has no trouble pushing over anything standing in its way: from people, cars, and even a mobile trailer.
  • Resilience: Throughout the film, Gwoemul's thick skin is able to withstand multiple shotgun blasts (some at close range), slashed at with a metal pole, struck in the eye with an arrow, and set aflame both externally and internally after drinking gasoline. It was only finally killed when the same metal pole was impaled through its throat.
  • Immunity: The Agent Yellow chemical used in the film was made specifically to kill Gwoemul, but to no avail. From the secondary effects of the toxin, people nearest to the center are sickened to the point of coughing up blood, others pass out, whereas the creature was only temporarily stunned before getting back up as if nothing happened.
  • Speed: Gwoemul can run very fast and can outrun anyone in a straight pattern even with only two legs supporting its weight. However, it tends to trip and tumble while turning.
  • Clutching feet: The pads that make up Gwoemul's legs are actually made up of two reptilian feet and a "webbed thumb" attached to each other up to the tarsus, allowing it to easily grasp and climb up walls with no problem.
  • Prehensile tail: Gwoemul can use its tail as an extra limb, allowing it to climb underneath a bridge with ease or grab something in a hurry.
  • Intelligence: Gwoemul tends to use tricks and tactics in order to ambush prey. Rather it be pretending to sleep, playing dead, or simply hiding from range, Gwoemul tends to always have the upper hand to lower its prey's guard.


While the film itself went on to become a critical and financial success, Gwoemul itself received praise from critics for its originality and small size compared to other giant monsters. Unlike many other monster-themed films, Gwoemul is fully seen at the beginning in the film, sometimes for long stretches of time or in broad daylight, which also earned the film some praise.


  • Gwoemul's origin story is loosely inspired by a true event that occurred in 2000, in which a Korean undertaker working for the US military was forced to dump a large amount of formaldehyde down the drain leading to the Han River. Bong Joon-ho, the director of The Host, obtained inspiration for a movie monster following the controversy when a local article was published on a deformed fish with an S-shaped spine that was caught from the river.
  • While Gwoemul is never given a proper name in the film, outside of the film it is often nicknamed after the original title of the film Gwoemul, which is Korean for "Monster". While this name is occasionally used in the original South Korean film, it is unknown if this name or any other is used in any of the foreign language dubs.
    • Weta Workshop, the New Zealand special effects and prop company that created the modeling of Gwoemul, referred the monster as Steve Buscemi.
  • Early concept art of Gwoemul shows that it was supposed to have a whole swarm of fish stuck in its back rather than the three used in the actual film.
  • The movie's popularity earned it a special status in its home country. Besides the Han river, which the movie's setting is near to, a statue of Gwoemul was erected.
  • Only two of Gwoemul's onscreen victims are killed without being devoured or dying while stored in its sewer pit; the two being Donald, who lost an arm during Gwoemul's rampage at the beginning of the film and later bled to death in the hospital (justified as Gang-du interrupted the assault by smashing the cement end of a street sign on Gwoemul's tail, driving its anger onto him), and Hee-bong, who was pinned to the ground and slammed upon sidewalk pavement by Gwoemul's tail, but strangely ignored by the creature who simply fled into the river after killing him.
  • While is can be debated on what exact creature Gwoemul mutated from, some speculation suggests that it may have been an amphibian rather than a fish, given the creature's ability to walk and breathe on land. It is also possible that it may be a mixture of the two.
  • Gwoemul could be seen as symbolizing the mishandling of toxic chemicals and their effects on nature, similar to how Godzilla is a symbol for the use of nuclear weapons.
  • Gwoemul (under the name "Tadpole Thing") was ranked #10 on Cinemassacre's "Top 10 Giant Movie Monsters" list.
  • In the upcoming prequel to The Host, Gwoemul's origins will be expanded, possibly hinting that it may not be the only mutant created by the formaldehyde dumping.
  • Gwoemul (or something similar to it) was meant to appear in an American remake of The Host by Universal Pictures. Although it was set to be released in 2011, the film is currently stuck in development hell.
  • The Gwoemul can be easily dealt with conventional high caliber ammunitions so there is no need to use chemical weapon on its.