Undercover High School

언더커버하이스쿨 ‧ Drama ‧ 2025
Completed
Mark A Darien
0 people found this review helpful
Mar 31, 2026
12 of 12 episodes seen
Completed 0
Overall 8.5
Story 8.0
Acting/Cast 9.0
Music 6.5
Rewatch Value 8.0

Secret Missions and High School Chaos

Undercover High School follows Jeon Hae-seong, a skilled NIS agent tasked with going undercover at a high school. From the very first episode, the show delivers an exciting and engaging opening, blending action with a sense of urgency that immediately draws the viewer in. While the overall storyline was solid, there were moments where the pacing felt uneven, and certain scenarios dragged longer than necessary, which occasionally tested my patience.

One of the strongest elements of the series is how it portrays Jeon Hae-seong’s character. His awkwardness in everyday situations contrasts sharply with his ability to rise to the occasion when circumstances demand it, giving his character a relatable yet heroic edge. The series does a commendable job highlighting his growth and unwavering dedication to uncovering the truth, which forms the backbone of the narrative.

However, the inclusion of a romantic subplot felt largely unnecessary and somewhat forced. It appeared to exist primarily to tick the “romance” box rather than to genuinely enhance the story, and the show would have maintained a stronger and more cohesive tone had it focused solely on action and comedy.

On a brighter note, the villain was exceptionally well-developed. With a compelling backstory and clear motivations, the antagonist adds real depth and stakes to the plot, elevating the series beyond a standard action-comedy.

Cinematographically, the show shines during comedic moments and high-energy action sequences, capturing both humor and intensity with skill. The soundtrack, while serviceable, didn’t particularly stand out, though it effectively complemented the overall mood.

In summary, despite some pacing issues and the unnecessary romantic subplot, Undercover High School is an enjoyable watch. Its strong character development, well-crafted villain, and blend of action and comedy make it a series worth checking out.

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Completed
AidyTheWeird
0 people found this review helpful
Dec 20, 2025
12 of 12 episodes seen
Completed 0
Overall 6.0
Story 5.0
Acting/Cast 7.0
Music 7.0
Rewatch Value 4.0

A bad mix of mystery, action and comedy

Honestly, I found the drama a bit disappointing, as its comedic potential was often overlooked in favor of mystery and action. While the comedic moments, particularly those featuring O Su-a or the NIS team, were entertaining, the focus on mystery and action felt misplaced. At first, there was a sweet romance between the two main characters, Seo Kang Joon and Jin Ki Joo. However, their relationship often felt like it was less important than the main plot. Some of the supporting characters weren't very interesting, and the antagonist didn't have much depth. The mystery quickly became predictable, which resulted in the later episodes being less engaging, culminating in a rushed and unsatisfying ending. The drama did have its brighter moments, despite these flaws. The dynamic between the male lead and his team provided some of the most enjoyable scenes, showcasing genuine friendship and teamwork. And when the balance of action and comedy was just right, it was genuinely entertaining. Ultimately, this drama demanded a certain suspension of disbelief and proved to be light, chaotic, and undemanding if you chose not to overthink it. However, it just didn’t deliver on its promise of a cohesive and engaging story.

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Completed
Nicholas
0 people found this review helpful
Aug 30, 2025
12 of 12 episodes seen
Completed 0
Overall 8.0
Story 7.5
Acting/Cast 10
Music 8.5
Rewatch Value 7.0

Quiznos

Kim Shin Rock absolutely stole every single moment she appeared in throughout the show. Whenever she was on screen, I could not pull my eyes away. Her intensity was electrifying, and the way she played off the hero made every interaction feel charged with energy and weight. By the end, I realized I was actually rooting for her instead of the lead, which caught me by surprise. I enjoyed the entire experience far more than I expected. Oddly enough, now I have this sudden craving for Quiznos.

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Completed
darcysjjh
0 people found this review helpful
Apr 1, 2025
12 of 12 episodes seen
Completed 0
Overall 8.0
Story 7.5
Acting/Cast 9.0
Music 8.0
Rewatch Value 5.0

Seo Kang Joon finally puts his good acting to use!

seo kang joon returns to the little screen with a bang! and what a comeback!

this drama started good and ended up great. it’s not life changing nor will it blow your mind, but it’s the perfect pick me up if you’re in the mood for some genre mixing feel good drama. it doesn’t take itself too seriously, but it’s propelled by strong performances, a fun soundtrack and great action scenes. the plot is actually super well thought out and unique, in a way.

i loved this! definitely recommend if only to see seo kang joon return in a (finally!!!!) good drama. please keep it coming kang joon-ah, we need to see your hazel eyes and great acting way more than we currently do.

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Completed
linxminx
0 people found this review helpful
May 3, 2025
12 of 12 episodes seen
Completed 0
Overall 7.5
Story 8.0
Acting/Cast 8.0
Music 6.0
Rewatch Value 7.0

A Good Treasure Finding Tale

Just a good old fashioned treasure finding story. A mystery abounds in trying to use clues to find the treasure. Along the way the ML falls in love with a helpful (and smart) damsel. There are plenty of bad guys and one sinister femme fatale who put kinks into the treasure hunting. There are twists and turns, a mystery to solve, teenage drama, overly comedic scenes, and plenty to keep you tuned in. This is good 'ol Kdrama at its finest.

Loved the actors!! The casting director really got the right actor in the right part. It is just entertainment in its purest sense. This reminds me of one of the first Kdramas I watched, and why I got hooked on Kdramas in the first place. Try it. I guarantee you'll enjoy it if you are just looking to be entertained.

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Completed
Little Joy
0 people found this review helpful
Apr 14, 2025
12 of 12 episodes seen
Completed 0
Overall 8.0
Story 8.0
Acting/Cast 8.0
Music 7.0
Rewatch Value 8.0

A Gripping Blend of Action, Emotion, and Social Commentary

The drama's centered around Jeong Hae Seong, an NIS agent who goes undercover at an elite high school to track down a hidden national treasure. It has a mix of suspense, emotional storytelling, and strong social themes that kept me hooked from start to finish.

What I Liked:

1. Strong, Multi-Layered Characters
Jeong Hae Seong is such a compelling lead. He’s not just an action hero. He’s vulnerable, haunted by his own past with school bullying, and constantly evolving. His relationship with Oh Su A, a teacher having it rough at workplace too, adds an emotional heartbeat to the story. Their slow-burn relationship was great.

2. A Well-Woven Plot with Unique Twists
The whole treasure hunt tied into ghost stories was so clever. The mystery is built up with care, and each episode drops just enough clues and twists to keep you engaged.

3. Thoughtful Social Commentary
This isn’t just a spy-thriller. The drama digs into the toxic school hierarchy, bullying, and corruption, all rooted in real social structures. It doesn’t sugarcoat things.

4. A Solid Supporting Cast
Everyone added depth and complexity to the story.

What Could’ve Been Better:

1. Too Many Tropes
Just way too many tropes.

2. Character Choices
Hae Seong and Director Kim (not together) both made decisions at some point which threw me off. It wasn’t a dealbreaker, but it did pull me out of the story now and then.

3. Romance Left Me Wanting More
There was definitely chemistry between Hae Seong and Su A, but the romantic payoff felt a little rushed. A few more meaningful scenes could’ve made it even more satisfying. Hey, I'm not mad at it but if you were looking for an intense romance tied into the plot, this isn't it.

There were other things to play on our emotions with. It has a gripping plot, and real-world themes. While not perfect, it’s a powerful story that’s both entertaining and thought-provoking. If you're into dramas with action, mystery, and meaningful character growth, this one’s definitely worth your time.

Would I recommend it?
Yes, especially if you love undercover plots with heart and a touch of romance.

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Completed
Beatrice
0 people found this review helpful
Sep 21, 2025
12 of 12 episodes seen
Completed 0
Overall 7.0
Story 7.0
Acting/Cast 7.0
Music 7.0
Rewatch Value 7.0
This review may contain spoilers

Strongest as a mystery thriller treasure hunt. Unbearable as a Romcom

None of the promo materials that I saw indicated this was a treasure hunt, which makes it so much more interesting that the undercover highschooler teacher romance, which is as creepy as it sounds whenever the story dipped into that plot line that also grinds the pacing to a halt. It is the worst part of the show which unfortunately means more often than not the female lead who is the teacher in the equation is the worst part. She is a terrible teacher not noticing the actual bullying occurring in her classroom while being extremely violent with the male lead who she thinks is a teenager and violating boundaries by showing up at his house on short notice. Once she learns he's NIH undercover, both of their brains go out the window. They are always out drinking together or touching hands, they are just courting a student teacher scandal.

The treasure hunt however is quite interesting, I really enjoy the clues being hidden in tales of ghostly hauntings that also mirror the real life school bullying of Hae Jeong and his classmates. The villain of the treasure hunt storyline is amazing. She is both cunning and unsettling that other kdrama villains think they are. The way she picks apart her daughter's self esteem, what she does with a steak knife to her own wrist in front of her daughter who freaked out at the photoshoot refusing to expose her scarred wrists, what she quotes about a slavery era book. Her daughter being cruel to Hae Seong's sister who just accepts it in order to be kind to the girl she saw with the scarred wrists. Later when she beats up a kid in the rest room who badmouthed her daughter in front of her and she chastises him to watch his mouth around elders while banging her own head on the mirror is so unhinged.

The romance is so forced, the drama would have been stronger without it. The secondary romance was also terrible and never funny even though it was supposed to be comic relief moments. The spy versus mastermind dynamic between Hae Jeong and Myeong Ju is so much more electric to see . I don't know if it's because I just didn't catch it, but I didn't see any specific branding on the sandwich shop until ep 4, which is a funny mini background mystery until it's revealed to be Qiuznos. The end where Hae Jeong points a gun at Myeong Ju only to hand it over to the same woman clearly having a dangerous mental health episode where she's already threatening the entire class of kids with oil and fire, was ridiculous. He's otherwise smart enough most of the time. I like that he clocked the principal truly caring about Myeong Ju and Ye Na and urged him not to enable her anymore.

The treasure hunt ending in Hae Jeong getting closure in finding out what happened to his father is meaningful. It's lovely that the cute little star motif between him and his father leads him to the gold his dad hid. All of his classmates showing up at his father's funeral was sweet. He got to remake his high school experience that was so terrible he got a GED instead the first time. His adopted father and son relationship with his uncle is also really sweet. I loved the moment he supported his decision to quit high school and was the one suggesting the GED. His annoyance at the thought that his adopted sister Yu Jeong may become his colleague is funny because he was colleagues with his adopted dad. Though there were still elements that I enjoyed, the momentum of the mystery and the pacing of the story really fell apart towards the end. It might have been a tighter with a few episodes less.

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Completed
michelleoc
0 people found this review helpful
Jan 27, 2026
12 of 12 episodes seen
Completed 0
Overall 8.0
Story 7.0
Acting/Cast 10
Music 6.0
Rewatch Value 1.0
This review may contain spoilers

So much to enjoy in the dramedy

SPOILERS!!!!!

I'll start by saying that I think you have to leave your expectations as the door. This isn't Shakespeare. The plot sometimes has holes so big you could drive a bus through them. But, even with that, I really enjoyed this one, for numerous reasons:

1) Seo Kang Jun - I find him very attractive, and not in a "pretty" way, if that makes sense. His intermittent smiles were wonderful. The last scene in the last episode - gold! When he gets emotional, it's very well restrained and not over the top. My heart broke when he found his father.

Also, I love how they included his father and that he had conversations with him. That was a chapter for him that wasn't closed yet.

2) Jin Ki Joo - She is fascinating to me. She has a different look about her and I find her beautiful. She always portrays characters that you want to be friends with. I wish they would have delved deeper into a back story for her.

3) The comedy was comedy-ing! There were so many laugh out loud moments, and I was impressed by Seo Kang Jun's comedic timing.

4) At the beginning, I was afraid I wasn't going to be able to stick with it because of the bullying (of students AND teachers), but I LOVED how he developed friendships with the other students. When he went to say goodbye to the students and was leaving the building, the paper airplanes made me cry.

5) The ML and FL were cute together, but the romance was definitely secondary. I loved watching them together.

6) Happy ending, though a five-year time jump seemed excessive.

7) Finally, Kim Shin Rok. Wow!! Watching her progress from a run-of-the-mill baddie to seriously unhinged was so compelling to watch. Does she always play a villain? I'm going to have to check out her filmography.

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Completed
InspectorMegre
0 people found this review helpful
Feb 3, 2026
12 of 12 episodes seen
Completed 0
Overall 9.0
Story 10
Acting/Cast 9.0
Music 8.0
Rewatch Value 7.0

Really fun kdrama about deep subjects

It is a kdrama for young at heart, since the place of the drama is a school, a lot of it is told from the students' perspective, and FL is a very ... naive teacher LOL

The ML actor is fantastic, he was soooo fun. His costuming was superb, the funky uncombed hair and open necktie LOL He was sooo fun to watch.

the issues presented were deep issues though, and involved corporate crime, school bullying, privileged elites, bad greedy parenting, as@ kissing to climb social hiararchy, the hierarchy itself and how even the kids participated in that willingly.

it really is a drama about intentionally creating and maintaining elites. A super deep subject camouflaged under school myths and gossips...

And the underlying story of ML's parents and what it means to be a secret agent, and a little historical lesson on Japanese occupation, etc

WHY was the drama taken off Viki and other places so fast after it finished airing?

Where is the ML actor now, he is really a fun actor, and I didnt see him since this drama. We miss him :) Come back soon

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Completed
FDiyF
0 people found this review helpful
21 days ago
12 of 12 episodes seen
Completed 0
Overall 7.0
Story 7.5
Acting/Cast 8.5
Music 6.5
Rewatch Value 5.0

Solving the Mystery of the King’s Treasure

A botched mission forced Jeong Haesong and his team to accept an undercover mission to make up for the mishap. The objective is to retrieve a lost stash of goldbars from King Gojeong era that is believed to be hidden at Byeongmun High School by the school’s founder. Going undercover as a student in his foster sister’s class, Jeong Haesong finds himself caught in between saving his new classmate from bullies and suspicion from his homeroom temp teacher Oh Su A that could really blow his cover. Burdened by the weight of his father who went missing on a mission quite like his, Jeong found that there is much bigger scandal in Byeongmun High School that he could ever anticipated and he absolutely needed all hands on deck to stay in school.

I think Seo Kangjun did a well done job portraying Jeong Haesong, a somewhat efficient agent who is also rather hotheaded had not for his foster father An Seokho who is also Team 4 team leader reigning him in. Despite the general air of the show being somewhat comedic, Seo still managed to carry out the grief-stricken scenes when needed, complete with reddened, teary eyes and convincing sobs. I especially love the Team 4 members, the team leader Oh Seokho, the tech support Park Mijeong and clownish member Ko Yeonghun, all seemingly rely a lot on Jeong Haesong’s capability as an NIS agent.

A special shoutout for Kim Shinrock for the successful portrayal of the psychopathic chairwoman of Byeongmun High School director board. She is such a crack in the head that you can’t really expect how far she could go for survival. Her laughs really remind me of a demented serial killer.

I can never understand Korean working culture of groveling to the higher ups even when youre already at retirement age. The kind of groveling they show onscreen isnt for the faint hearted too as one is expected to wait for your boss 24/7 rain or shine night or day as if they don’t have a life, constantly bowing and sucking up to him to the point of putting your pride under their soles, a literal modern slave. It’s utterly mindblowing.

There wasnt as much action as I anticipated from a spy show though. Lots of sleuthing around, and riddle-solving, definitely not enough punches, kicks or bullets flying around. The action choreography isnt much of a wowsie too. I fastforwarded many of the romance scenes. Just not feeling it with the main cast. I loved the interaction between Park Mijeong and Ko Yeonghun though, never skipped a scene. 🤣 their scenes definitely exudes more chemistry that the main couple.

All in all is okay. The plot is really straightforward although not without plotholes. Some scenes did left me dumbfounded, but I treat this like a common entertainment show that doesnt need any logic. Don’t take them seriously and you may enjoy the show.

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Completed
Lisa89
0 people found this review helpful
Apr 26, 2025
12 of 12 episodes seen
Completed 0
Overall 9.0
Story 8.0
Acting/Cast 10
Music 8.0
Rewatch Value 3.0

It’s been a while

It’s been a while since I’ve seen an “old school” K-Drama, at least for my liking. I needed an entertaining, unrealistic, wholesome but well executed drama. I’ve been having some troubles to find a K-Drama with this perfect formula of fun, lighthearted and a well written story despite being just 12 episodes. Most of shorter dramas nowadays tend to be mediocre cause they can’t build nor the plot nor the characters. This one was the perfect example of a well done story in just 12 episode: it doesn’t have plot holes, they closed the series and all the characters’ arcs in a good way, without leaving you with unanswered questions, it didn’t waste precious time screen on useless scenes… This is what I want from a drama of this genre.
I also loved the focus on the friendships rather than the romantic relationships. Bonus point: I’m so glad we got to see Seo Kang-Joon in a role where he could showcase different sides for his character, the troubled and the goofy one, it suited him to well.

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Completed
PseudoMonas
0 people found this review helpful
Sep 23, 2025
12 of 12 episodes seen
Completed 0
Overall 9.0
Story 8.0
Acting/Cast 9.5
Music 8.5
Rewatch Value 8.0

A big shoutOut for Casting Director

Every Drama has Plotholes If you intend to search for that,But there are some dramas when you even couldn't Notice those holes because of Actors/actress's outstanding Performance. This drama is one of those drama.I thoroughly enjoyed every episodes,Waited to see next episode,couldn't sleep at night without being finished it and getting hangover effect after finishing it-- All Those are criteria of a Good drama and 10/10 Drama from me.That's how a Drama should entertain you.

Cast and Their acting :* Literally every single actors Did well.Seo kang stole my heart i really want to see him in another agent drama, his Body, face card hard to ignore.

What i liked : Obviously Seo kang (ML).
* Jin go (FL) Did her role perfectly -She seems like a passionate teacher.and she proved it.
* ML Team- They were so funny to watch.although for NIS agent kinda lousy.But they will make you laugh.
* All the Student Character - YeNa and Yu jeong friendship deserve another series.They nailed their character.
* And THE VILLAIN : The psychopathic acting was done so well that even i got scared.

What i think average (Not disliked)

The villain troupe and Motive of her being Villain.The intention behind her villaining was not enough to hate her.Her crime should be more grievous. But still ok.

Overall a Nice, refreshing watch.Welcome back Seo kang.You nailed it.❤️🧡💛💚

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Undercover High School poster

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  • Score: 8.5 (scored by 35,189 users)
  • Ranked: #673
  • Popularity: #232
  • Watchers: 69,164

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