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* AdultFear: Everything that happens to Shim Seok-gu. He walks into his home one day and finds his daughter talking to the serial killer who almost killed him. The shock causes him to end up in hospital, unable to talk and forced to watch as In-woo continues to hang around Bo-kyung. Made especially horrifying when In-woo [[EvilGloating gloats about the situation]] and threatens Bo-kyung, knowing Seok-gu can't do anything to protect her.

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* AdultFear: AdultFear [=/=] AndIMustScream: Everything that happens to Shim Seok-gu. He walks into his home one day and finds his daughter talking to the serial killer who almost killed him. The shock causes him to end up in hospital, unable to talk and forced to watch as In-woo continues to hang around Bo-kyung. Made especially horrifying when In-woo [[EvilGloating gloats about the situation]] and threatens Bo-kyung, knowing Seok-gu can't do anything to protect her.

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* AdultFear: Everything that happens to Shim Seok-gu. He walks into his home one day and finds his daughter talking to the serial killer who almost killed him. The shock causes him to end up in hospital, unable to talk and forced to watch as In-woo continues to hang around Bo-kyung. Made especially horrifying when In-woo [[EvilGloating gloats about the situation]] and threatens Bo-kyung, knowing Seok-gu can't do anything to protect her.



* CuteAndPsycho: Subverted. Dong-sik is very cute and not at all psycho, but he ''thinks'' he's a psycho.



* FaceOfAnAngelMindOfADemon: In-woo doesn't look dangerous and -- when other people are around -- he acts normal. He's also a psychopath who enjoys killing people.



* LaughingMad [=/=] MirthlessLaughter: In-woo has a very unhinged half-laugh half-grin that he uses when planning to kill someone.

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* LaughingMad [=/=] MirthlessLaughter: PsychoticSmirk: In-woo has a very unhinged half-laugh half-grin that he uses when planning to kill someone.


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* SharpDressedMan: In-woo is rarely seen wearing anything but a suit, even when threatening and killing people.
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* LaughingMad [=/=] MirthlessLaughter: In-woo has a very unhinged half-laugh half-grin that he uses when planning to kill someone.


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* OutGambitted: In-woo plans to kill Bo-kyung and make it look like suicide. Dong-sik realises his plan. No one will take Dong-sik's warnings seriously because they all think he's a serial killer, so he exploits this by pretending to threaten Bo-kyung. The police assume he really means to harm her so they immediately start looking for her. In-woo has to flee and Bo-kyung survives.


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* SpannerInTheWorks: Dong-sik constantly ruins In-woo's plans just by existing. Shown especially when In-woo is about to murder Bo-kyung, then learns Dong-sik has got the police looking for Bo-kyung.

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* AccidentalMurder: Played with. Dong-sik and Mu-seok fall down the stairs. When Dong-sik wakes up he finds Mu-seok dead with a knife in his chest. He assumes he accidentally killed him in the fall. [[spoiler: Actually In-woo killed Mu-seok while Dong-sik was unconscious.]]



* StaircaseTumble: Dong-sik and Mu-seok fall down a flight of stairs. [[spoiler: Mu-seok dies when he lands on his knife.]]

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* StaircaseTumble: Mu-seok dies after he and Dong-sik and Mu-seok fall down a flight of stairs. [[spoiler: Mu-seok dies when he lands on his knife.]]stairs.
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* StaircaseTumble: Dong-sik and Mu-seok fall down a flight of stairs. [[spoiler: Mu-seok dies when he lands on his knife.]]
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* YouHaveGotToBeKiddingMe: In-woo watches in disbelief as Dong-sik ScreamsLikeALittleGirl, jumps backward, collides with several barrels and ends up on the floor.
--> '''In-woo:''' What? Are you kidding me?
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** Mu-seok attempts to blackmail In-woo with photographs of a murder he committed. In-woo hides in Mu-seok's car, knocks him out, and kills him.

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** Mu-seok attempts to blackmail In-woo with photographs of a murder he committed. In-woo hides in Mu-seok's car, knocks him out, and kills kidnaps him.

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* DangerTakesABackseat: In-woo hides in Mu-seok's backseat. As soon as Mu-seok gets in the car In-woo sedates him.



* MuggingTheMonster: Sung-cheol threatens In-woo with a knife and tells him to drive where Sung-cheol tells him to. In-woo goes along with it... for a while.

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* MuggingTheMonster: MuggingTheMonster:
**
Sung-cheol threatens In-woo with a knife and tells him to drive where Sung-cheol tells him to. In-woo goes along with it... for a while.while.
** Mu-seok attempts to blackmail In-woo with photographs of a murder he committed. In-woo hides in Mu-seok's car, knocks him out, and kills him.
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* MissingMum: Both Dong-sik and In-woo lost their mothers years before the series starts.
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* EvilGloating: In-woo indulges in this when he taunts the nearly-comatose Detective Shim.


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* SlasherSmile: In-woo has a truly terrifying grin.
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* MuggingTheMonster: Sung-cheol threatens In-woo with a knife and tells him to drive where Sung-cheol tells him to. In-woo goes along with it... for a while.
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* MistakenForMurderer:
** Played with, since in this case a character mistakes ''himself'' for a murderer. Thanks to In-woo's diary and a case of amnesia Dong-sik becomes convinced he's a serial killer.
** Chil-sung also believes Dong-sik's a murderer.
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* AnAxeToGrind: In-woo tries to kill Dong-sik with an axe.
* AxeCrazy: As a child In-woo was willing to murder his half-brother. He just gets worse from then on.
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* BookcasePassage: In-woo has a hidden room full of weapons hidden behind his bookcase.
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* MistakenForGay: One of In-woo's "friends" assumes Dong-sik is In-woo's lover.
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* TroublingUnchildlikeBehavior: As a child In-woo planned to kill Ji-hoon because Ji-hoon had taken In-woo's room.
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* BlackComedy: Much of the series' humour is dark. Highlights include Dong-sik planning to kidnap Ji-hoon only to realise an adult is too heavy to carry around in a bag and Dong-sik preparing to kill Ji-hoon then being interrupted by the phone.
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* BigScrewedUpFamily: The Seo family. In-woo is a serial killer, his half-brother Ji-hoon has people beaten up for annoying him, Ji-hoon's mother hates In-woo, and their father is dismissive of both of them.


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* OneDialogueTwoConversations: In-woo tells Dong-sik he knows what he's doing and he can't deal with Ji-hoon on his own. Dong-sik is planning to kill Ji-hoon and thinks his plan has been discovered. In-woo actually means the anonymous post Dong-sik made about Ji-hoon.
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* ShareTheMalePain: Bo-kyung kicks a mannequin between the legs. Her colleague and Dong-sik react with horror and agonised groans.

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* NeverSuicide: In-woo drugs the homeless man and sets fire to the building. The police put it down as suicide by arson. Bo-kyung is the only person who suspects it wasn't.

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* NeverSuicide: In-woo In-woo's modus operandi is to make his murders look like suicide. Bo-kyung is the only person who suspects foul play.
** He causes a gas leak in an elderly woman's home and gets her to lock herself in.
** He
drugs the homeless man and sets fire to the building. The police put it down as suicide by arson. Bo-kyung is the only person who suspects it wasn't.
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* NeverSuicide: In-woo drugs the homeless man and sets fire to the building. The police put it down as suicide by arson. Bo-kyung is the only person who suspects it wasn't.
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Yook Dong-sik witnesses a murder. He picks up a diary belonging to the murderer, but then he's in a car accident, develops amnesia, and assumes the diary is his and he's a psychopath. The real killer is Seo In-woo, Dong-sik's boss, who wants to retrieve his diary.

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Yook Dong-sik witnesses a an attempted murder. He picks up a diary belonging to the murderer, but then he's in a car accident, develops amnesia, and assumes the diary is his and he's a psychopath. The real killer is diary really belongs to Seo In-woo, Dong-sik's boss, boss and a serial killer, who wrote about his crimes in it and wants to retrieve his diary.
it.



* GoryDiscretionShot: Used for one of In-woo's murders. We see him approach the victim, then cut to blood on the floor, then cut again to outside. Downplayed, though, since [[ShadowDiscretionShot we see the silhouette of In-woo beating the man to death while blood splashes on the glass door]].

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* GoryDiscretionShot: Used for one of In-woo's murders.when In-woo tries to kill the homeless man. We see him approach the victim, then cut to blood on the floor, then cut again to outside. Downplayed, though, since [[ShadowDiscretionShot we see the silhouette of In-woo beating the man to death while blood splashes on the glass door]].



* ShadowDiscretionShot: The characters' silhouettes are all that's shown when In-woo beats a man to death.

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* ShadowDiscretionShot: The characters' silhouettes are all that's shown when In-woo beats a man nearly to death.
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* MistakenForCrazy: Bo-kyung's InnerMonologue takes the form of her father showing up in strange places. Sometimes she responds to him out loud. Everyone else is very confused to see her apparently having a conversation with herself.
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* ExtremeDoormat: Dong-sik starts out as one. He stops being one once he becomes convinced he's a psychopath.

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* AttemptedSuicide: Dong-sik plans to commit suicide in the first episode. He doesn't go through with it.


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* InterruptedSuicide: A variant. Dong-sik plans to commit suicide but is too scared to do it. So when he sees a car arrive at the building he uses the possibility of being caught to convince himself to go home.
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* AttemptedSuicide: Dong-sik plans to commit suicide in the first episode. He doesn't go through with it.

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* GoryDiscretionShot: In-woo's sixth murder. We see him approach the victim, then cut to blood on the floor, then cut again to outside. Downplayed, though, since [[ShadowDiscretionShot we see the silhouette of In-woo beating the man to death while blood splashes on the glass door]].

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* GoryDiscretionShot: Used for one of In-woo's sixth murder.murders. We see him approach the victim, then cut to blood on the floor, then cut again to outside. Downplayed, though, since [[ShadowDiscretionShot we see the silhouette of In-woo beating the man to death while blood splashes on the glass door]].


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* [[OminousLatinChanting Ominous Korean Chanting]]: Shows up on the soundtrack occasionally.
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* GoryDiscretionShot: In-woo's sixth murder. We see him approach the victim, then cut to blood on the floor, then cut again to outside. Downplayed, though, since [[ShadowDiscretionShot we see the silhouette of In-woo beating the man to death while blood splashes on the glass door]].


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* ShadowDiscretionShot: The characters' silhouettes are all that's shown when In-woo beats a man to death.
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* HowWeGotHere: The series starts with Dong-sik being arrested for seven murders. Then it flashes back to before he found the diary.
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[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/psychopath_diary_poster.jpeg]]

''Psychopath Diary'' (싸이코패스 다이어리, ''Ssaikopaeseu Daieori'') is a 2019-2020 South Korean comedy/thriller series starring Yoon Shi-yoon, Jung In-sun and Park Sung-hoon.

Yook Dong-sik witnesses a murder. He picks up a diary belonging to the murderer, but then he's in a car accident, develops amnesia, and assumes the diary is his and he's a psychopath. The real killer is Seo In-woo, Dong-sik's boss, who wants to retrieve his diary.

The series can be watched [[https://www.viki.com/tv/36757c-psychopath-diary on Viki]] with English subtitles.

!!Contains examples of:
* EasyAmnesia: Dong-sik gets amnesia from being hit by a car.
* SecretDiary: The titular diary. Unusually it belongs to a man in this case.
* SerialKiller: In-woo has killed at least six people.
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