Undercover High School (2025)
A sharp-witted spy trades the field for a classroom in this breezy Korean action-comedy about hidden identities, buried treasure, and unexpected romance.
Undercover High School - Series Information
- Original Title: 언더커버 하이스쿨
- First Air Year: 2025
- Last Air Year: 2025
- Created by: Im Young-bin, Choi Jeong-in
- Type: TV Series
- Genres: Action, Adventure, Comedy, Drama
- Episode Runtime: Average runtime per episode (70 minutes)
- Number of Seasons: 1
- Number of Episodes: 12
- Status: Returning Series
- Original Language: Korean
- Spoken Languages: Korean
- First Air Date: February 21, 2025 (South Korea - 15)
- Networks: MBC
- Alternative Titles: Disfarçado no Ensino Médio (BR), 臥底高中 (TW), Undercover High School (US), متخفي المدرسة الثانوية (SA)
- Production Countries: South Korea
Undercover High School - Plot
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.
Undercover High School - Trailer
Watch the official trailer and get your first look at the action-packed classroom chaos:
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Undercover High School - Cast & Crew
Creator(s)
- Im Young-bin
- Choi Jeong-in
Main Cast
- Seo Kang-joon
- Jin Ki-joo
- Kim Shin-rock
- Kim Min-ju
- Yoon Ga-i
- Kim Young-ah
- Lee Hyun So
- Yun Chae-bin
- Kim Sun-min
Writers
- Im Young-bin
Undercover High School - FAQs
Where can you stream Undercover High School?
Undercover High School is available to stream on OnDemandKorea (including a free ad-supported tier) and on Kocowa. It is also accessible through the Kocowa Amazon Channel for subscribers who prefer to watch via Amazon's platform.
Who are the lead actors in Undercover High School?
The series stars Seo Kang-joon as undercover NIS agent Jeong Hae-sung and Jin Ki-joo as high school teacher Oh Su-ah. Supporting cast includes Kim Shin-rock, Kim Min-ju, Yoon Ga-i, Kim Young-ah, Lee Hyun So, Yun Chae-bin, and Kim Sun-min.
Is Undercover High School based on a true story?
No, Undercover High School is not based on a true story. It is an original fictional Korean drama blending action, comedy, and romance around a spy mission involving the legendary lost gold of King Gojong, a historical figure from the Joseon dynasty.
What is the story behind King Gojong's gold?
In the series, King Gojong's gold refers to a cache of missing royal treasure that becomes the target of a covert NIS operation. The gold serves as the central MacGuffin driving the plot, sending agent Jeong Hae-sung undercover into a high school to track it down.
When did Undercover High School first air?
Undercover High School premiered on February 21, 2025, in South Korea on the MBC network. The series consists of 12 episodes and was still in production at the time of its broadcast run.
Does Seo Kang-joon play a student or a teacher?
Seo Kang-joon plays NIS agent Jeong Hae-sung, who infiltrates a high school by posing as a student — despite being a trained adult spy. The comedic tension between his professional instincts and the demands of pretending to be a teenager is a key source of humor in the show.
How many episodes does Undercover High School have?
Undercover High School has 12 episodes in its first season, each running approximately 70 minutes. There is also a Season 0 consisting of one special episode, bringing the total episode count to 13 across all available content.
What are shows similar to Undercover High School?
Viewers who enjoy Undercover High School may also like The Third Charm (2018), Grid (2022), and Save Me (2017) for their genre-blending storytelling. For lighter romantic comedies with a similar playful tone, The Potato Lab (2025) and The Demon Hunter's Romance (2025) are strong picks.
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