[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/save_the_green_planet_8589.jpg]] ''Save the Green Planet!'' is a BlackComedy[=/=]ScienceFiction film directed by Jang Jun-hwan. The film was inspired by ''Literature/{{Misery}}'', particularly the director's dissatisfaction with the characters being one-dimensional.

A mentally disturbed young man and his girlfriend kidnap a wealthy executive, convinced that the latter is really a top-ranking alien on a mission to destroy Earth. A young police officer and his older mentor race to rescue the executive before it's too late. Meanwhile, the clock counts down to the lunar eclipse, on which time the earth will be destroyed...

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!!This film contains examples of:
* AncientAstronauts: According to the executive's speech, humans were created by the aliens based on their DNA. This narrative includes many classic features of the trope, including the creation of cavemen and a ShoutOut to the beginning of ''Film/TwoThousandOneASpaceOdyssey''. [[spoiler: The aliens actually look like people from ancient Chinese/Buddhist art.]]
* AssholeVictim: The executive's EstablishingCharacterMoment is him being a jerk to his taxi driver, and he's a CorruptCorporateExecutive who had a hand in Byeong-gu's mother's accident. Much of the movie involves him getting tortured.
* AxeCrazy: Byeong-gu is violently crazy, and at one point threatens to cut off the executive's foot with an axe.
* BattleInTheRain: During the final showdown in the chemical plant, something causes the fire sprinklers to go off, so most of the final battle takes place in the rain.
* BloodIsSquickerInWater: Used several times.
** When [[spoiler: the older police officer]] dies, a GoryDiscretionShot shows his blood flowing through a mountain stream[[note]]which is then immediately subverted as the camera pans to his bee-covered corpse[[/note]].
** In the final showdown, there are a number of shots of the characters blood mixing with the water from the fire sprinklers.
* BreakThemByTalking: The executive tries this repeatedly from almost every possible angle, constantly mouthing off at Byeong-gu whenever he gets the chance: insulting Byeong-gu, appealing to his plans, appealing to his love of his family. It sort of works when he tells Sooni that Byeong-gu doesn't love her, but she just leaves instead of freeing him.
* {{Cloudcuckoolander}}: Sooni is a childlike circus performer who believes everything Byeong-gu says, even though he's obviously off his rocker.
* TheCloudcuckoolanderWasRight: [[spoiler: The executive turned out to be an alien the whole time as Byeong-gu suspected]].
* ColdBloodedTorture: Byeong-gu's modus operandi.
* CorruptCorporateExecutive: A news montage shows that the kidnapped executive had a history of getting out of jail in shady ways. He's all buddy-buddy with the chief of the police, and runs a chemical plant with several disgruntled employees and another (Byeong-gu's mother) who was put in a coma by her work.
* CreepyDoll:
** The underground torture chamber is filled with mannequins and mannequin parts, as Byeong-gu claims to make mannequins for a living. They don't ever do anything, but they form a creepy background.
** Sooni is constantly playing with Franchise/{{Barbie}}s, and when the Chairman tells her that Byeong-gu doesn't love her, she tears off the doll's head. After she leaves, several shots show Byeong-gu playing with the headless doll, heightening the disturbing atmosphere.
* CreepySouvenir: Byeong-gu's creepy basement is filled with preserved human limbs in jars, which were collected from his previous victims who he interrogated and killed to find out if they were aliens.
* DaChief: A very sycophantic and incompetent chief of police, who refuses to listen to the young cop and takes him off the case, [[spoiler: even after his older mentor goes missing,]] and hauls in an obvious false lead.
* {{Determinator}}: The Chairman, who constantly tries to psych Byeong-gu into releasing him, and repeatedly desperately tries to escape even while severely injured or drugged.
* DownerEnding: [[spoiler: Byeong-gu is shot dead by the police and the aliens view Earth as a failed experiment and end up blowing it up.]]
* EarthShatteringKaboom: [[spoiler: What happens at the end. The aliens declare Earth a failed experiment and blow it up.]]
* FedToTheBeast: Byeong-gu feeds his victims to his dog Earth. Discovering human bones near the dog's pen tips off the older cop that Byeong-gu is the kidnapper.
* FreudianExcuse: Byeong-gu's father lost his arm in a coal mine, and was killed by his mother when he attacked her and Byeong-gu. Byeong-gu was also beaten in school by the students and the teachers, and ended up in jail, where he watched his girlfriend die. Eventually he snapped when his mother was put into a coma.
* GreyAndGreyMorality: Byeong-gu is a crazy SerialKiller and torturer, but he's a WellIntentionedExtremist convinced he's out to save the world. All his victims are jerks who to some extent have it coming to them. It's also unclear for much of the movie if the aliens according to Byeong-gu are good or bad- are they there to destroy the world or save it?
* TheGreys: Byeong-gu's UFO literature portrays aliens as grey aliens with big saucer eyes.
* HumanAlien: Byeong-gu thinks the executive is an alien disguised as a human. [[spoiler: Turns out he's right, and there really are aliens, who look just like Daoist immortals (people with big earlobes).]]
* ImpaledPalm: The executive is nailed to a chair by his palms.
* LookBehindYou: Byeong-gu tries to keep the older detective from seeing his TV with surveillance footage of the tied-up executive by saying "Oh look, there's a UFO outside".
* {{Manchild}}: Sooni is very childlike, and still plays with dolls.
* MentorOccupationalHazard: [[spoiler: The older detective]], who mentors the younger one, dies about halfway through the movie.
* MoodWhiplash: The film goes from surreal comedy to horror in a second. [[http://youtu.be/3NLbDgyMusk This trailer]] should give you an idea of what to expect.
* PetTheDog: The younger cop doubles back to save Byeong-gu's dog after he escapes captivity and goes to take down Byeong-gu.
* PhotoMontage: There's one over the credits.
* {{Revenge}}: As the chairman points out in one of later {{Breaking Speech}}es, this is really what drives Byeong-gu. In all of his investigations, only two of the eleven people he captured actually turned out to be aliens according to Byeong-gu's notes. Instead he convinces himself that people who hurt him in the past are aliens, and captures and tortures them out of revenge.
* ScaryStingingSwarm: Byeong-gu throws honey on a police officer and releases several crates full of bees. Guess what happens.
* SceneryPorn: Lots of gorgeous shots of the green mountains, which contrast with the depressing depths of the torture dungeon.
* SheFu: When Sooni shows up to save Byeong-gu, she does some impressive handsprings to attack him and then dangles from the ceiling to avoid bullets. Justified, as she's a circus acrobat.
* ShoutOut: The executive's speech about the aliens is a close copy of the opening of ''Film/TwoThousandOneASpaceOdyssey'', with ape-like early humans pounding bones together next to an alien obelisk.
* SistineSteal: The classic "God touching Adam" pose is used during the executive's speech about aliens, overlaid with colored lightning.
* SoundtrackDissonance: The film makes heavy use of various mixes of "Over the Rainbow", a wistful and innocent song, which almost always precede torture scenes.
* StockFootage: The executive's speech about the aliens makes heavy use of stock footage of Nazi war atrocities.
* TortureCellar: Byeong-gu has multiple levels of cellar underneath his compound which he uses to torture and interrogate suspected aliens.
* TraumaticHairCut: The executive's head is shaved early on as Byeong-gu believes that the aliens can communicate to each other with their hair.
* TwistEnding: [[spoiler: The executive was an alien prince all along.]]
* WellIntentionedExtremist: Lee Byeong-gu believes he's saving Earth. [[spoiler: Turns out [[NiceJobBreakingItHero he condemns it]], as the executive really was an alien, here to determine if Earth was salvageable; guess what his final verdict is.]]
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