“Mouse” Episode 3 And 4 Review – A Huge Plot Twist, Who Is The Serial Killer?

Published Categorized as K-Dramas and K-Movies
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tvN’s new drama “Mouse” has introduced another HUGE plot twist with its 4th episode, and we’re here to talk about it and discuss what just happened.

“Mouse” has been a mixed bag thus far in my opinion, especially with its premiere, but as the episodes goes by, we get to see bits and pieces of the full picture and it’s looking promising.

I must say I like the dynamics in “Mouse” thus far in terms of relationships, I especially like that we won’t have a love triangle in such a messy environment and that the stakes are already very high.

Note: this is a subjective review and filled with spoilers of the episodes in the title. I will share my personal opinion while keeping in mind how others might perceive it.

Both female leads have connections to what could be serial killers, so let us discuss “Mouse” Episode 3 And 4.

The sloppy serial killer Sung Yo Han

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I didn’t expect Hong Ju to have been dating the serial killer Sung Yo Han, she also seems to be aware of his true identity according to what I saw “Mouse” episode 4.

“Mouse” episode 3 honestly surprised me; I didn’t expect Doctor Daniel Lee to be killed so early on in the series. They’re moving at a faster-than-expected pace which is very intriguing considering how “Mouse” is actually going to be 20 episodes long. If this is the type of plot progressions we’re gonna get each week, I wonder how far the screenwriter is willing to take it.

If there is one thing I noticed about “Mouse” episode 3 specifically is how sloppy serial killer Sung Yo Han is. After people saw the 4th episode, some think he’s not even a serial killer, but we see his face killing doctor Daniel Lee, so I assume that he’s at least killed some people. He’s also killed his friend when the police began zoning in on him.

The thing that shocked me, like I said before, is how sloppy he was. Especially with the murder of the grandma and his friend, if he gets caught in multiple situations close to the killings, it will certainly attract attention and he’ll be eventually caught.  

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At this pace, this guy will be caught very soon. They will soon tie him to his friend some way or another, and with enough digging, they could eventually find out that the grandma had gone to his house. Even if they don’t pin the rest of the murders on him, he’ll be charged with at least 3 eventually.

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However, I don’t know if he’s killed all of the victims we’ve seen thus far, let me explain why below!

The curious case of Jung Ba Reum

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If Jung Ba Reum is a actually psychopath, there is no chance on hell he’d ever be a good boy but it’s mostly an image he’s keeping up, not every psychopath ends up a serial killer but psychopaths would struggle to show the emotions he shows with the depth we’ve seen thus far.

Since its genetic, it can’t ever be fixed. Period. I don’t know how the screenwriter plans on handling this part but I’d be very disappointed if he gave any of the serial killers in this drama a pass in terms of a redemption arc. These people don’t feel the same way normal human beings do.

BUT… BUT… WAIT FOR IT!!

Or we could have been misled and Jung Ba Reum had kept the child with him to lure out the actual serial killer, and this was merely misdirection on the part of the screenwriter.

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I am having trouble believing that the screenwriter would make the first male lead a serial killer, I have personally rarely seen it done before in kdramas, maybe in movies, but almost never in kdramas [exclude OSN dramas, specifically Strangers From Hell]. Often than not, it’s merely a bunch of misunderstandings that leads the viewers in the wrong direction to hide from the actual murderer. Screenwriters avoid doing that because it’d be difficult for the viewer to be attached to a terrible murderer, many would be turned off by it, it’s not easy to write scripts with unlikeable characters, it’s doable, but not easy.   

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Another screenwriter had something similar with “Flower of Evil” but that case was a bit clearer to me, I knew almost instantly that I was watching what I’d label a ‘misdirection.’

What I concluded thus far is the following; there is more than one killer in this drama, this will likely be the case. It could be that the drama is about Jung Ba Reum and Sung Yo Han and their serial murders and how Go Mu Chi ends up finding out about them…. or it could be there is another serial killer aside from the one we know of thus far.

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With how sloppy Sung Yo Han is, I find it difficult that he’d be able to get away with it for more than 8 more episodes and even then, we’d have about 8 episodes left. That’s a lot of content to write.

I am still not 100% convinced Jung Ba Reum is a serial killer, but if it turns out to be true, I’d be hella impressed. I wish that would be the case because it’d be interesting to see how people would react to seeing Lee Seung Gi playing a role so different from what he’s done this far in his career.

Some fans are sharing a different theory, that Jung Ba Reum is the one who killed the grandma and faked his car accident to avoid suspicions. This theory is backed up by how whenever we saw the basement of Sung Yo Han, it only had photos, which some could argue were taken from the police rather than by the actual killer. Jung Ba Reum could’ve been scared she found out about him somehow and went to kill her…. I don’t know how to feel about this theory but I am sharing it.

What is clear thus far is that whoever Jae Hoon [the child character] turns out to be is likely the serial killer they’re looking for, you can see the child eyeing the church cross when he left the police station and we’re almost certain he’s killed his father and his step-siblings.

So these are my thoughts on “Mouse” Episode 3 And 4, what about you guys? What theories do you have to share?

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By Jass K.

Hi, I am Jass k. I discuss some of the hottest currently airing kdramas on this site in form of reviews an/or recaps, join me in the discussion~

15 comments

  1. Even i had doubts that the 5 th ep must be misleading us and it can actually be a plan to lure out the real killer but i do wish he is a psychopath cuz that would be fun to watch.and even I thought why the hell did they kill Dr daniel so early.So is jaehoon head hunters son?? And one thing i dont get is , at the police station, where jaehoon is questioned he is the only survivor right?? Cuz orelse the mother would also be at the station. But yohan is hunters son for sure becuz his mother is head hunters wife. But I really don’t get lee seungii’s role so far.

    1. LSG might be the other pregnant lady’s son that was at Dr Daniel Lee’s clinic. Her fetus also had the psychopath genes. Remember how that lady said her husband was a kind man so there is no way her baby would have that genes?

  2. Hi! After I’ve finished epi 4, I couldn’t sleep at all from over analyzing!! My guess is that, Ba Reum just wanted to lure the psychopath that’s why he kept the child, so the killer will show himself and come out.
    But I’m still confused with the intentions of Ba Reum. He’s like the “too good to be true” man.
    If he will also he a psychopath, can’t wait to see Seunggi portrays that role.
    I really can’t wait for next week’s episodes!! Im going crazy thinking about it!!!

  3. I really do feel like Bareum is actually Head Hunter’s son while Yohan is his step-brother (the mother’s second marriage – a son and a daughter). I think that Yohan actually knows that Bareum is the killer and has been tailing him that’s why whenever there’s a killing, a clip of Yohan can be seen because he’s not actually doing the murder, but tailing his Bareum, the step-brother who threatened him and tried to bury him alive. I also believe that the female producer is NOT his lover but instead his sister, sure the touching is a bit weird but maybe that’s just their relationship and it’s just a hug. This would explain why he came to his sister’s house in fear because he saw Bareum kill the Psychology Doctor, because psychopaths DO NOT FEEL FEAR, it would not make sense why he would randomly go to his “girlfriend’s” house and hug her randomly and profess that he’s deadly afraid. I have been suspecting Bareum since the beginning and I will list a few moments that raised my suspicion:
    1. The bird-car scene. Bareum was nearly hit by Mu Chi’s car because he saved a bird from the road. The suspicious thing regarding this action is the natural instinct of a “regular” human being is to grab and get off the road. Especially since he’s a police officer, his reflects must be quick. It makes no sense why he would dawdle at the road.
    2. Showing off the bird. After Bareum ‘saved’ the bird, he somehow made a whole ‘show’ i.e made it obvious amongst his colleagues that he saved a bird by resting it in a make shift box.
    3. He only portrays emotions or vulnerability whenever somebody is nearby. Example of such situations are -puking while seeing the corpse of a cat, though no puke came out, he was just dry heaving, -crying while watching the boy happiness show while his step mom? auntie? was cooking in the kitchen
    4. Too nice that it’s scary. Bareum has been painted to be this ‘angel’ with no flaws so far which is not possible for a human being. His need to show that he is kind to people (excessively) is surely just a joke to him when the victims find out so that their soul will be crushed. Similar to what happened to his step-dad, taking away the things that he loved, and in this case taking away their trust.
    5. His random memory loss about knowing Mu Chi and the female producer. Surely you would remember someone whom you rejected several times as well as someone that almost ran you over.
    6. (PERSONAL OPINION AND SPOILER) Because I previously watched Busted season 2, Lee Seunggi played a nice detective which turned out to be the villain all along, that’s why I knew to not trust him, lmao.
    7. If Yohan is the killer, the story line will be too plain. The thing about Crime dramas is how the killer was later revealed. Even if they were to be revealed early, the purpose is to show how the killer toys around with the police force. It would be a bold move to set Bareum as the killer especially since he’s one of the main character. So the story will be regarding Mu Chi & Yohan VS Bareum.
    8. The grandma. Yohan is too sloppy, he could have been chasing the grandma because he was scared the grandma would misunderstand. Bareum then took the opportunity to put the blame on Yohan because he knew Yohan was a suspect.
    9. Plot. I believe Yohan and the female producer are siblings because the writer have been pushing Mu Chi and the prod. to end up together. They might have made it seem one sided (for Mu Chi) but it would not have made any sense as the prod. have been seen consistently always by Mu Chi and not spending time with Yohan, her supposed boyfriend. (kind of weak, but just take it)

    These are just my 2 cents regarding this show and I don’t know if you’ll agree but it’s just my opinion.

    1. Very plausible. The only flaw is that the sister to Dr Yohan is that she was portrayed as an autistic child when she repeated word for word the scene when Jaehoon poisoned Stepdad’s fishes. Autistic people don’t recover that completely, if ever, to be like the girl producer. But I like your take of this Baruem being the killer and Dr Yohan is just a misdirection by the writer to put us off track.

    2. Hi, I think the producer and Yohan is not siblings..She is kid who was at the first episode who witness the girl(The sister of the Boxer who got killed recently)..

    3. but there were three bodies for which jaehoon was investigated, i was thinking it would be the brother, sister and the father but where is the mother thats confusing

  4. Forgot to add this in. Continuing from my previous comment here are some of my opinions regarding Bareum as the Killer.

    1. He is trying to be close (and succeeding) with Beong Yi (?) because he wants to follow his father’s footsteps in leaving an offspring and continuing their bloodline. Beong Yi is the best candidate as she is someone that is “easy to be hunted” – “petite and lack of strength”, though you may say that Beong Yi is a boxer, she is not strong mentally as she is still suffering greatly from her PTSD which puts her strength to waste. She has no parents and only a frail grandma as a guardian. Bareum has the grandma wrapped around his pinky, to ensure that truly Beong Yi will continue his bloodline. He also made it so that Beong Yi has no one else to turn to and for her to depend on except for him. Not to mention, Beong Yi is still very YOUNG and is very impressionable. She was shown initially not looking at Bareum in a romantic sense, but due to the grandma’s constant match making agenda plus Bareum’s onslaught of ‘kind’ gestures that can be regarded as brotherly, become something of a romantic sense. This can be paralleled with the Head Hunter’s excessive kindness to the wife, building a whole studio for her wife’s flowers.

    2. Grandma’s funeral. Bareum despite being heavily injured, attended to the funeral’s attendees. He is openly showing that he is a ‘kind’ human being and the ideal husband to ensure that people would not think twice that he is a cold murderer.

    3. Yohan trying to kill Bareum. I believe Yohan is Bareum’s step brother. It would make sense that Yohan was trying to kill Bareum because he knows that Bareum is psychopathic serial killer and could also be a revenge for Bareum trying to kill him when they were younger.

    4. Mouse. The mouse has been used to portray the image of an assumed to be weak creature yet proofed to be deadly. So far, Yohan has not been shown to be weak and frail, he immediately stood out to be someone cold and emotionless. Bareum on the other hand would never be suspected as he is a “warm and kind person” a kin to the portrayal of a mouse.

  5. First time that I will be going to Reddit for a k drama! I think there are two killers. Are they working together? Or hunting each other? Is this the penthouse of cop dramas?

  6. The first episode opens up with a girl alluring someone to get killed in a car. That girl was the female cop. It will circle back as her being the mastermind of everything, she may not kill but she may instigate or manipulate the 2 psychopaths into committing murder by using their weakness. Not only genes but also the environment children grow in can shape who you will actually become.I think this the essence of the movie, as people are not born evil but made evil.

    1. Is there a female cop ? Or do you mean the producer of that program Sherlock something ? Yes, she could be the little girl who lured a young woman to her death in the opening scene in episode 1, but I don’t think she is a mastermind of the all the killings by manipulating the murderer/s. It will be interesting to know what is her connection to all this and how she, as a little girl, became involved in luring a person to her death. Maybe she had lured others to death too at that tender age.

  7. @DAYACRY SAME SAME!

    IF YOU WATCHED BUSTED THAT’S HOW LEE SEUNGI IS/WAS PORTRAYED TO BE THE NICE DETECTIVE BUT ENDS UP BEING THE EVIL ONE.

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