Release calendarTop 250 moviesMost popular moviesBrowse movies by genreTop box officeShowtimes & ticketsMovie newsIndia movie spotlight
    What's on TV & streamingTop 250 TV showsMost popular TV showsBrowse TV shows by genreTV news
    What to watchLatest trailersIMDb OriginalsIMDb PicksIMDb SpotlightFamily entertainment guideIMDb Podcasts
    OscarsEmmysToronto Int'l Film FestivalIMDb Stars to WatchSTARmeter AwardsAwards CentralFestival CentralAll events
    Born todayMost popular celebsCelebrity news
    Help centerContributor zonePolls
For industry professionals
  • Language
  • Fully supported
  • English (United States)
    Partially supported
  • Français (Canada)
  • Français (France)
  • Deutsch (Deutschland)
  • हिंदी (भारत)
  • Italiano (Italia)
  • Português (Brasil)
  • Español (España)
  • Español (México)
Watchlist
Sign in
  • Fully supported
  • English (United States)
    Partially supported
  • Français (Canada)
  • Français (France)
  • Deutsch (Deutschland)
  • हिंदी (भारत)
  • Italiano (Italia)
  • Português (Brasil)
  • Español (España)
  • Español (México)
Use app
Episode guide
  • Cast & crew
  • User reviews
  • Trivia
IMDbPro

Undercover High School

Original title: Eondeokeobeo Haiseukul
  • TV Series
  • 2025–
  • TV-14
  • 1h 10m
IMDb RATING
7.8/10
3.2K
YOUR RATING
POPULARITY
2,243
146
Seo Kang-joon in Undercover High School (2025)
Undercover High School Teaser
Play trailer0:44
1 Video
44 Photos
ActionComedyThriller

Ace NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her ... Read allAce NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her lost first love, stirring old heartbreak.Ace NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her lost first love, stirring old heartbreak.

  • Stars
    • Seo Kang-joon
    • Jin Ki-joo
    • Kim Min-ju
  • See production info at IMDbPro
  • IMDb RATING
    7.8/10
    3.2K
    YOUR RATING
    POPULARITY
    2,243
    146
    • Stars
      • Seo Kang-joon
      • Jin Ki-joo
      • Kim Min-ju
    • 29User reviews
    • 3Critic reviews
  • See production info at IMDbPro
  • Episodes12

    Browse episodes
    TopTop-rated1 season2025

    Videos1

    Undercover High School Teaser
    Trailer 0:44
    Undercover High School Teaser

    Photos43

    View Poster
    View Poster
    View Poster
    View Poster
    + 40
    View Poster

    Top cast16

    Edit
    Seo Kang-joon
    Seo Kang-joon
    • Jeong Hae-seong
    • 2025
    Jin Ki-joo
    Jin Ki-joo
    • Oh Soo-ah
    • 2025
    Kim Min-ju
    • Lee Ye-na
    • 2025
    Kim Shin-rock
    Kim Shin-rock
    • Seo Myeong-joo
    • 2025
    Jeon Bae-soo
    Jeon Bae-soo
    • Ahn Seok-ho
    • 2025
    Lee Seo-hwan
    Lee Seo-hwan
    • Kim Hyeong-bae
    • 2025
    Park Jin-woo
    • Park Jae-moon
    • 2025
    Kim Young-ah
    Kim Young-ah
    • Soo-ah's Mother
    • 2025
    Park Se-hyun
    Park Se-hyun
    • Ahn Yoo-jeong
    • 2025
    Lee Min-ji
    • Kim Ri-an
    • 2025
    Jo Bok-rae
    Jo Bok-rae
    • Go Young-hoon
    • 2025
    Yoon Ga-yi
    • Park Mi-jeong
    • 2025
    Lee Hyun-so
    • Han Seung-jae
    • 2025
    Shin Joon-hang
    • Lee Dong-min
    • 2025
    Oh Yong
    • Head teacher
    • 2025
    Seo-young Lee
    • Park Minji
    • 2025
    • All cast & crew
    • Production, box office & more at IMDbPro

    User reviews29

    7.83.1K
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10

    Featured reviews

    10yourseoulfully

    Kick buttowski

    In this era of K-dramas like "Squid Game" and "All of Us Are Dead," sometimes we just need a breather, don't we? "Undercover High School" serves that purpose beautifully. As the title suggests, it follows the story of an NIS agent who goes undercover. The series is action-packed, fun, spontaneous, and intense, while also sprinkling in humor and a touch of romance.

    The acting is top-tier, and the chemistry between the leads is captivating. It has been a while since we've had characters with such distinct antagonistic roles, making it interesting to watch the events unfold. My only complaint is that it was too short-only 12 episodes, oh my gosh! The drama struggled to focus on the couples, but I still craved and enjoyed their screen time together so much! Hae-song was literally born to play this role.

    It's definitely worth a watch, period. Thank you for taking the time to read this! I hope you enjoy the series and have a wonderful day!
    9gokil-34680

    Must Watch Korean drama

    I'm not really into Korean dramas, but I highly recommend you to watch this.

    If you like this, u should like undercover:
    • Start up
    • Itaewon class


    How's the drama: Cool actors, so much thrilling and good ending. No scene that make you so angry and so sad. The story are plenty of thrilling, easy, no drama (so much talking).

    From this drama i concluded: 50% Action 35% Comedy 15% Romance

    The action is good. The movement, strategy (part of story), etc.

    The comedy, this is i like the most. Action + comedy sometimes makes you feel disgusting right? But, here make you laugh if you get it. (old people hard to find all jokes here)

    A bit romance, if you wonder how's the romance goes like other romance drama, not here.

    Overall, like the first sentence i wrote. It might be 9,8 Stars for this, because some little detail on shoot are missing (like the movement, you can't realize if you focus on story).

    See you on my next review, bye!
    10sunyya

    loving, living, and laughing this show & seo kang joon fr <333

    I'm so so sad that this show is j 12 eps, it deserves 20 eps. I finished this show a week ago and i already have the urge to rewatch it again.

    The story line, the dialogues and delivering chaotic energy in such a non-cringe and natural way i loveeed it istg. So so so good. I love chaotic shows and the element of the NIS agent to this show j makes it sm hotter for me alr istg.

    I had actually never heard of seo kang joon before, but brothers and sisters i am already obessed w this man. He is so underrated i don't get why. His acting is so so so natural loved it. His character was so manly but pookie which is absolutely loved. What i love the most is eyes istg. The most beautiful eyes i have ever seen on a man to date, im not even kidding.

    Jin ki joo, i love her too. Her character was so cute, i wanted to keep her in my pocket literally. Even she herself as an actress phenomenal and again so underrated.

    The chemistry between jeong hae-seong and oh su-a was insane. Believe me when i tell you even their hands had chemistry.

    Love this show, lowkey wanna lose all my memories and watch this masterpiece again.
    10Squireljiu

    It's getting better and better

    Story: **** Cast: ***** Cinematography: ***** Fun: ***** (Five starts as full)

    I have just finished ep4. The pace is fast and the story is unfolding better and better. It wouldn't be a very thrilling detective story as the plot is kind of expected at the moment. But it's an "easy-going" drama with a mix of everything: fun, romance, thriller... School bullying is a frequent element appearing in kdrama, and this one has quite a good depiction. It will make you feel lighter after watching it, or it will make your eyes filling with tears.

    Plus Seo Kang Joon is my favourite actor so it's a must watch for myself!

    I will recommend it to you too!
    6pranayjalvi

    Second half was not even half of what First half was.

    Starring Seo Kang Joon and Jin Ki Joo, Undercover High School is a action drama that happens within a school, as the name suggests. With giving any spoilers, the drama starts strong, with some suspense and twists, good action and mature storytelling. The first half is engaging, although there are unserious moments at times.

    While the start was strong, the second half of the show falters to some extent, as there was not much fun left to the premise. I won't say the show is skippable, but it surely doesn't have a rewatch value.

    While the show is a mystery-spy themed, the drama also focuses on tougher subjects like school bullying, student hierarchies, and the politics which govern the lives of both students and teachers.

    A little romance with comedy elements in regular intervals somehow keeps the drama balanced. Maybe not strongly recommended as there are better dramas in this genre, but Undercover High School is a fun and watchable drama that does silly and clever things simultaneously.

    3 stars for 'Undercover High School'.

    More like this

    Study Group
    8.3
    Study Group
    My Dearest Nemesis
    7.3
    My Dearest Nemesis
    Treasure Island
    7.5
    Treasure Island
    Love Scout
    7.8
    Love Scout
    The Trauma Code: Heroes on Call
    8.4
    The Trauma Code: Heroes on Call
    Way Back Love
    8.1
    Way Back Love
    Resident Playbook
    8.0
    Resident Playbook
    Return to the Palace
    7.8
    Return to the Palace
    The Witch
    7.1
    The Witch
    The Potato Lab
    7.0
    The Potato Lab
    The Judge from Hell
    7.8
    The Judge from Hell
    Love Refresh
    7.1
    Love Refresh

    Related interests

    Bruce Willis in Die Hard (1988)
    Action
    Will Ferrell in Anchorman: The Legend of Ron Burgundy (2004)
    Comedy
    Cho Yeo-jeong in Parasite (2019)
    Thriller

    Storyline

    Edit

    Did you know

    Edit
    • Trivia
      First acting role for lead male actor Seo Kang-Joon since he completed his compulsory military service on May 22, 2023.

    Top picks

    Sign in to rate and Watchlist for personalized recommendations
    Sign in

    Details

    Edit
    • Release date
      • February 21, 2025 (South Korea)
    • Country of origin
      • South Korea
    • Official sites
      • Kocowa (United States)
      • Naver (South Korea)
    • Language
      • Korean
    • Also known as
      • Під прикриттям у старшій школі
    • Production companies
      • Neo Entertainment
      • Slingshot Studio
    • See more company credits at IMDbPro

    Tech specs

    Edit
    • Runtime
      • 1h 10m(70 min)
    • Color
      • Color

    Contribute to this page

    Suggest an edit or add missing content
    • Learn more about contributing
    Edit pageAdd episode

    More to explore

    Recently viewed

    Please enable browser cookies to use this feature. Learn more.
    Get the IMDb App
    Sign in for more accessSign in for more access
    Follow IMDb on social
    Get the IMDb App
    For Android and iOS
    Get the IMDb App
    • Help
    • Site Index
    • IMDbPro
    • Box Office Mojo
    • License IMDb Data
    • Press Room
    • Advertising
    • Jobs
    • Conditions of Use
    • Privacy Policy
    • Your Ads Privacy Choices
    IMDb, an Amazon company

    © 1990-2025 by IMDb.com, Inc.