
This review may contain spoilers
Waste of time
Started off very intriguing, but they just suddenly changed the whole tone from "we are doing some detective work stuff" to "aliens and cults lol, go figure". Like we just had jumped from realistic world with one paranormal thing happening to suddenly new spaces, weird cult, classroom teacher doesn't even exist btw, world is warping how it only wants to, hive mind and people being sacrificed for... something for some reason.At the end of the day I don't like this drama. I think it was kinda cheap and "what the hell are they writing' kind of ending". I don't even understand what that was. It just came out of nowhere. Some of the stuff didn't even get any resolution and just got ignored. Too many unexplained things. It was so good until the last episode. . They tried to squeeze in as much plot twists as it was possible so it was just rather confusing and meh.
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This Show Really Pissed Me Off
If I had glasses that showed how many brain cells I lost watching this, they’d be glowing red.I really don't understand the high ratings honestly but to each their own, shall we dive into the review?
Let’s start from the beginning: when I first read the plot, it sounded interesting. But after watching the actual drama? Big mistake. The first episode gives a completely misleading impression of what the show is actually about, setting you up for a totally different plot than what we get.
The plot is absolutely stupid, cheesy, cringe, and illogical.Since when has the world been so obsessed with people’s body count that they'd literally kill over it? The whole premise gives off major slut-shaming and purity culture energy where people are obsessed over it. It’s just gross.
The female lead was supposedly agoraphobic for years, unable to even step outside her house, but in one day she becomes a normal high-school student who doesn’t care about being perceived, makes friends and gets a boyfriend? Make it make sense.And don’t even get me started on the absurd focus on the magical glasses. Like, how are glasses the first logical step in a murder investigation??? What dots did they even connect? The obsession with the glasses was just conveniently stupid.
Now, let’s talk about the so-called """"plot twists"""".Like Kang Seon Ah being raped by her grandpa and the shady homeroom teacher turning out to be the villain. The whole “rape backstory” felt extremely unnecessary, just thrown in for shock value and to maintain that dark genre. It added zero relevance to the actual plot. We didn’t even get context or depth, it was just there for trauma points.
Then we get to the teacher, who also sees the “S Lines” and starts acting like a full-on cult leader. Her final monologue to the FL was:
“Can’t you feel their desire to see the lines? I’m a mere mouthpiece for their longing.”
I started LAUGHING.Like girl, be serious. The writers really tried to make this “deep” and “symbolic,” as if society is desperate to know who people are sleeping with. Newsflash: they’re not. This isn’t profound, it’s just embarrassing.
I’ll stop here before I write a whole essay, but if you made it this far, just trust me and avoid this ridiculous drama that honestly should’ve been a short movie—or better yet, never aired at all.
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So Much Potential, So Little Payoff
The concept was good. But the drama lost its way.At first, it was a tight, claustrophobic social experiment. A girl cursed with this “gift,” a detective hiding his own broken past, a society rotting under moral policing. Each storyline, whether a SA victim shamed for her "excessive" lines or a brother reckoning with the hypocrisy of his cheating family, reflected an uncomfortable truth about how people judge sexuality.
And then… it happened. Suddenly, we’re in a dystopian fever dream. A teacher-turned-cult-leader summoning some “desire dimension”? Allegory, sure, but messy, rushed, and tonally WRONG. The characters stopped being people and became props. Even the boyfriend’s death felt cheap. Shock value over meaning.
Instead of finishing its moral conversation, S Line bailed, hiding behind symbolism and leaving its most interesting ideas to rot.
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I laughed. I gasped. I blushed. And honestly, I wish I could have a chat with the author.
This show is both fantastic and unsettling.It tells a story of community, privilege, manipulation, lies, sex, cheating—and probably everything else you can imagine. People are torn from their familiar world and plunged into the horror of a world dominated by red lines.
S-lines are dangerous.They are scary and terrifying. They’re like the lovechild of a neon sign and a truth serum.
You’re probably thinking:
"How dangerous can red lines be?"
Well, imagine going to a Coldplay concert with your secret lover. Cameras catch you, the world watches, the memes explode, you’re forced to resign—and your spouse has already called a divorce lawyer.
That’s how dangerous they are.
These bright red lines hover above people’s heads and reveal things no one wants exposed:
*The most intimate stories that everyone wants to keep to themselves—and not have become public knowledge.
*The S line is a bright red marker that characters wear above their heads, and there’s no way to hide it.
*The S line shows the direction to the people you’ve been intimate with.
*The S line is also a weapon in unscrupulous hands.
*The S line can be power—if you have the gift, or the glasses, to see it.
*The S line can be a curse—because let’s be honest, how many people actually want to know about their neighbor's sex life?
And this isn’t even a spoiler. You learn all this at the very beginning.
To be fair, there’s nothing wrong with the S-line...
(Okay, that’s a lie.)
Unless you’re a decent, honest person who respects others and doesn’t cheat. Because beyond all the drama, the S line shows you—and everyone else—exactly who you are. And worse: you see it too.
Surprisingly, the S line itself isn’t the main story.
It’s more of a looming threat in the background—life gets messy not because of the lines, but because of people.Because let’s face it, our world can still be jealous, patriarchal, homophobic, racist, and cruel.
When I started the series, I expected a thriller—mystery, supernatural elements, suspense.And sure, you could say it has all of that...But what I didn’t expect were the social messages woven into the story.
At times, it felt like reading a Clifford Simak novel—those endings where he spells out what’s right and what’s wrong, just in case you missed it.
There’s a lot going on: complicated relationships, moral pressure, characters tempted into things they never imagined doing. They’re scared, trapped, and don’t even realize it until it’s too late.
This review is more of a snapshot of my thoughts so far.
There is a crazy twist ending… I knew something was coming, but not that! The various plot twists at the end caught me by surprise WTF?!
I’m torn. On one hand, I’m furious. They didn’t answer the questions that haunted me the most. The kind of questions you carry with you when the episode ends and you're just staring into space, replaying scenes in your head. But on the other hand… I can feel Season 2 lurking in the shadows, grinning and whispering, “You think this is over?” And maybe it's not supposed to be. Maybe this story isn't about clean resolutions or easy answers. Maybe it's about consequences. About choices—messy, raw, intimate choices—and how they follow us like S line we can’t shake. Because in this world, the truth is visible. It hangs above your head like a scarlet brand. There’s no hiding, no pretending, no safe distance from your own reflection.
Something like that.
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OKISH BUT WHAT THE HELL ENDING
LIKE I STARTED WATCHING IT AND IT HAD A GOOD CONCEPTAND THEN IDK WHAT THE HELL THEY DID IN 6TH EPISODE.
WHOLE SHOW WAS GOOD AND I WAS ON MY TOE LIKE THE CONCEPT ,CLEARITY, AND ALL THE THINGS
BUT IT WAS WHOLE SERIES VS EPISODE 6
AND A LOT OF SCENES WHICH WERE NOT NEEDED
IF THEY COULD HAVE CHANGED LAST EPISODE OR MAYBE ADDED SOMETHING ELSE
THIS COULD HAVE BEEN 10/10 EASILY
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What will happen, What will happen, that’s what happened?It’s super cheesy, just another bullying drama with crazy ppl that kill
The highschoolers focus ruined the first two eps, then the teachers ruined ep3-4 and the last two eps just went full on anime
I mean everything would’ve “been the same” even without the glasses/the slines
People find out about adultery, pedos and cheaters, and murder can be the after effect so this “special” vision isn’t that interesting
But to add some substance, cuz yeah you see a cheater what will you do? Leave like a normal person or do you do something crazy crazy
So they kept throwing any crazy connection and psychopathness
is it a twist? the wife is not the wife but the mistress xD
I mean the "real wife" is like 20 years younger than him, but his mistress has a 5 year old kid? while he gives his og wife the gifts and side times.. it doesn't make sense
and the 4th ep was just a rapist, raping a dying man. that's disgusting ;/ again, the lines mean nothing, a psycho is always a pyscho
The kids in ep5, they didn’t know about the lines, so to make that scheme to rape someone without touching them…
And honestly the ml was super mean there, doubting the girl instead of wondering if there were more rapists
And dahee turning into a, what was she, a being of “hate the connection”? Or hate human nature? Cuz I mean non of them reacted like a human
And the glasses did make them act uncharacteristically too, so is it even “human nature” that’s the problem
Tbh, why don’t they recognize the glasses? they're people in the same facility, and two I’d get a person seeing the lines, but the glasses? what are they made out of the pupil of someone who could see the lines? lol the answer was even worse than I expected
Honestly the ending was so disappointing, everything was so nonsensical
They kept adding ridiculous twisted twists and then they added super weird reasoning and then it was over
People made up their own theories, I didn’t read or think of them, because that’s a fun on its own and this didn’t deserve that much thought
It was really a simple “someone random sees the line cuz the goddess of the lines(?) wanted them to and she had to fuel enough energy to make the whole world see it”
Anyways again, the lore of the lines didn’t matter cuz it is a fictional “power”, but the behavior of the people was so over angsty and overblown, the problem wasn’t the lines but the few people that cheated, raped, and killed
I watched this cuz it was short, and cuz of the cast but they didn’t really do anything to reach their potential and if I don’t remember an ost, I consider it a loss rating
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What Happens When A Good Concept Isn’t Enough..
The concept of the drama is insanely interesting.. But where it fails is in exploring and explaining that concept properly.. You get these really good first five episodes and watch the last one expecting it to bring everything together, give a conclusion that explains it all or at least tries to.. But it fails and it fails grandly.. The drama went from a Serial Killer Thriller to Bullying Revenge to Sexual Assault to Teen Romance to whatever that was in the final episode.. The last episode was a mess.. I guess the writer came up with a great concept but just couldn’t use it to its full potential.. Each episode kept switching genres but I was not at all prepared for whatever happened in the final episode..I mean who was Lee Gyu Jin?? A mysterious entity born from people’s relentless urge to dig into the most private and intimate parts of others lives?? And this entity brings chaos and death in its wake?? Is that what it was trying to say?? I honestly don’t know.. The drama was never clear about the story it actually wanted to tell..
A few words about Lee Soo Hyuk.. It’s seriously disappointing how underrated this guy is.. Forget how good his acting is for a second.. Just with those looks and that voice alone, he should already have a long list of romance dramas under his name.. How is he being overlooked like this?? I mean, there are actors out there getting way better opportunities than him and their acting skills are a joke..
Overall, the drama was good until it wasn’t.. The concept is intriguing but ultimately ambiguous.. I did like the visuals though.. The quiet, haunting atmosphere really worked.. There were some creepy stuff and a few well placed twists.. That's why it never got boring..
That said, the writing messed up.. No offence, but if the story had been written by someone more capable, maybe the outcome would have been very different.. They didn’t even bother to explain what that place was in the last episode.. Hell?? Purgatory?? Some kind of special club for the S Line Glasses cult?? Who knows??
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Could’ve Been More, Settled for The Worst
Honestly, this drama could’ve been something, it had a fresh, somewhat “new” idea, but the execution was not it. The s line is actually kind of interesting and meme-worthy, but the rest of the show is mostly stupid. Like, do they think the audience is that dumb?Some parts were even borderline insulting. So many scenes felt like filler or just plain nonsense. And be warned: there are some gross or potentially triggering topics/scenes, so definitely check before diving in.
The characters were meh. Not really likable or interesting, except maybe Hyeon Hop, she’s the only one I kind of cared about. The rest? I couldn’t be bothered. The romance line was so unnecessary and flat. With only six episodes, they somehow managed to focus on all the wrong things, and left out the answers to the stuff that actually mattered.
Also,what's with the school bullying plotline? Do we really need to rehash this again in every K-drama? It added nothing new here. And don’t even get me started on the CGI for the slines, it was so bad, I couldn’t help but laugh.
The one thing I did like was Hyeon Hop finally finding friends. After everything she’s been through, that tiny glimmer of light in her life really hit me. She deserved that moment.(but of course it had to get ruined.)
Maybe I would've like this more if they went in the direction they were going ( I thought they would?) in the first episode.
At the end of the day, it was kind of entertaining, as a hate watch. It’s short, so if you’re curious, maybe give it a go… just don’t expect much.
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it had the potential to be a good mystry drama
the thing is it had the potential to be such a good drama. I watched 1-4 ep in one go as it got me hooked up but the ending really destroyed it. Like seriously I can't even express how disappointing the 5-6 ep is. the ending was confusing and foolish tbh. It was such a great and new concept but they just can't make a good plot. That teacher who can see the sline, that freaking character, they tried to portray her as mysterious but from the start, most of the people knew that she's somewhat related to all this. I actually liked that detective character but he was so dumb to be a detective. That's all for this one. Maybe they can use this sline concept in a better way and give us new season with actual mysterious plotline.Was this review helpful to you?

I'm like...so what?!
So like, what was the point? Is this gonna get a second season because this felt like a prologue to a story that was never told!The atmospheric buildup was interesting, but it was so short that nothing was properly developed. I had barely any emotional investment in the characters; the only thing keeping you watching is the bizarreness of the core elements of the story and the millions of questions that it inspires but by the end, the show answers maybe two questions?!
In the grand scheme of the confusion it inspires, what it answers is so little that I feel like it wasn't worth the trouble. The core character dynamics are weak, like why am I supposed to care about this romance if I have only watched two scenes between these characters? Why should I be invested in that investigation when the show itself doesn't even try to establish the facts of the events first? So the whole thing is a bit underdeveloped and confusing.
Then, on the other hand, it seems like the show has a format of exploring different case studies from episode to episode but the balance is so off. They sure make you feel uneasy, which I suppose was the effect they were going for but then how these B-plots connected to the ongoing A-plot that runs through the whole show was very weak.
This whole thing felt like a modern theatrical performance more than a TV show.
The acting was alright, the set design was good, but the plot was...I don't know, a bit pretentious but shallow? It was trying too hard to be mysterious and provocative, and it didn't always manage to land it right.
Overall, I didn't mind watching it, but it wasn't a stand-out watch either. You won't regret watching it if you really want to but it's also equally skippable.
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Seeing the Truth Isn’t Always a Blessing
S Line is a dark and gripping mini-series that combines mystery, psychological tension, and social commentary in a unique and disturbing way.Set in a world where red glowing lines appear above people who have had sexual relationships, the story follows a girl who can see these lines since childhood. For others, the S Line is invisible — unless they find and wear mysterious glasses that reveal them.
These glasses begin to randomly appear in different places, and once someone puts them on, things quickly spiral out of control. People become obsessed with what they see — the red lines between lovers, spouses, or even students and teachers — and this obsession leads to jealousy, shame, paranoia… and sometimes violence.
Each episode follows a different case where someone gets the glasses and their life takes a dramatic turn. What starts as curiosity often ends in tragedy, and the deeper the story goes, the more disturbing it becomes.
The series slowly reveals that someone might be spreading the glasses on purpose, claiming it’s “for the good of society.” But is it really? Or is it just another form of control?
What makes S Line so powerful isn’t just the shocking concept — it’s how real the emotions feel. It explores how people react when private things become visible, and how quick society is to judge.
The atmosphere is cold, the storytelling intense, and the idea of “seeing the truth” becomes more dangerous than comforting. The acting is strong, especially the lead actress, and the final episodes deliver some truly unsettling moments — but without ever becoming cheap or overly dramatic.
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I mean …. Not recommended to watch as someone who have seen it
did they shortly after shooting drama realized it must end as soon as possible to confuse people and use ML actor’s talent?!First two episodes were boring then it started to be more and more interesting but sudenlly it ended so quickly without any sense, at least to me. As many people mentioned it could have potencional especially with ML but last episode… honestly Wtf 😅
Yes interest idea with s lines, talented actors but that’s it.
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