Undercover High School
언더커버 하이스쿨
We checked 8 streaming services in India on 04 Jun 2026 at 09:35 IST
About
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.
Cast
Seasons
Episodes
Season 1
The Emperor's Lost Gold
After a botched operation puts Hae-sung and his team in serious jeopardy, the only way for him to salvage his career at the NIS is to accept an assignment that seems almost hard to believe. Hae-sung and his team must infiltrate Byeongmun High School, one of Korea's most elite private institutions, to recover ten tons of gold bars worth a staggering 80 million dollars. With everything on the line, Hae-sung puts on a school uniform, and "Operation Undercover High School" begins.
Spooky Stories
Hae-sung comes dangerously close to blowing his cover while searching for the hidden gold in Byeongmun High School's eerie old building, barely escaping detection by Soo-ah, his sharp-eyed homeroom teacher. As he hears chilling rumors and faces tight security surrounding the building, he believes that's where he'll find the gold. While dealing with school bullies, Hae-sung begins plotting his next move to uncover the dark secrets lurking inside the old building.
Ghost Story Riddles
Hae-sung uncovers a crucial clue hidden within the old building, but Chairwoman Seo quickly learns its potential connection to the elusive gold bars. Sensing the connection, she keeps Hae-sung under close watch. Meanwhile, as Hae-sung delves deeper into the ghost stories surrounding the school, he finds himself caught in the escalating tension between Tae-soo and Dong-min, whose conflict ignites chaos throughout the school.
Joining the Student Council
Hae-sung attends the anti-bullying committee session with a key witness who clears his name, while Dong-min finally finds the courage to stand up for himself. With his name vindicated, Hae-sung uncovers the existence of another grandfather clock hidden in the student council room, and the only way to get closer to it is by joining the student council. With the help of his team, he tries to meet the strict requirements.
Student Council
Hae Seong and the team grow increasingly concerned that Su A's suspicions could threaten his undercover mission. However, Hae Seong defies the odds and successfully gains a spot in the student council. With this new role, his focus shifts to unraveling the mystery behind the old clocks. Meanwhile, a shadowy figure emerges, threatening to expose Hae Seong's true identity
Hye Seong's Father's Notebook
The school's security guard dies, leaving Hae Seong a notebook belonging to his missing father. The revelation is shocking, and he storms the NIS for answers. The answer pushes him away from the mission, and he takes time off. However, he resolves to continue but returns only to discover Su A witnessed it all
The 24th Anniversary of Byeongmun High School
Hae Seong is caught off guard when he recognises Su A's childhood name, Bong Ja, which stirs memories of his first love and distracts him from his focus. Despite the emotional turmoil, Hae Seong pushes forward with the mission to uncover the secrets behind the third ghost story. However, a missing key component forces Su A to join the mission despite Hae Seong's strong opposition to her involvement
The Plan for VIP Students
After uncovering the possibility of a mole within the NIS, Hae Seong becomes increasingly distrustful of those around him, causing him to question the mission's integrity. Meanwhile, Su A exposes a secretive scheme within the school that guarantees top grades for VIP students. As the web of secrets deepens, Hae Seong uncovers the connection between the gold bars and Chairwoman Seo, prompting him to vow to end her sinister plans
Where does Undercover High School rank today?
Undercover High School is #905 on the CineFlixo Daily Streaming Charts today.
- Highest: #905
- Top 10: 0 days
- Top 100: 0 days
Watch Undercover High School Online Free — All Episodes in HD
Looking for a place to watch Undercover High School online for free? You've landed on the right page. Undercover High School is a well-rated Coreano action & adventure, comedy, and drama series from 2025 that you can stream right now on CineFlixo in high quality, no signup required.
About Undercover High School
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. Across 1 season and 12 episodes, originally airing on MBC.
Undercover High School Cast and Characters
The cast features Seo Kang-joon (as Jeong Hae-sung), Jin Ki-joo (as Oh Su-ah), Kim Shin-rock (as Seo Myung-ju), Kim Min-ju (as Lee Ye-na), and Yoon Ga-i (as Park Mi-jung). Their performances are a major reason Undercover High School has built such a passionate audience.
Where to Watch Undercover High School Online
CineFlixo lets you stream Undercover High School online free, instantly, in HD. There's nothing to install — open the page, hit play, done. Works perfectly on Jio, Airtel, Vi networks across India and on slow mobile data thanks to our adaptive video pipeline.
▶ Watch Undercover High School NowWhy People Are Watching Undercover High School
There's a reason Undercover High School keeps showing up on "must-watch" lists. What makes it work is emotional weight that hits where it counts, sharp comedic timing that lands consistently, and action sequences that don't feel cheap. If you enjoy Coreano storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.
Frequently Asked Questions about Undercover High School
Where can I watch Undercover High School online for free?
You can watch Undercover High School online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.
How many episodes does Undercover High School have?
Undercover High School has 12 episodes across 1 season. All episodes are available to stream right here on CineFlixo.
Is Undercover High School good? What's the rating?
Undercover High School holds a 8.0/10 rating based on 57 reviews — well above average.
Who is in the cast of Undercover High School?
The main cast includes Seo Kang-joon, Jin Ki-joo, Kim Shin-rock, and Kim Min-ju, plus a strong supporting ensemble.
Is Undercover High School available in Coreano?
Yes — Undercover High School was originally produced in Coreano and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.
When was Undercover High School released?
Undercover High School first aired in 2025.
Do I need an account to watch Undercover High School on CineFlixo?
No. CineFlixo is free and you can watch Undercover High School without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.
Similar Series You Might Like
If you enjoyed Undercover High School, check out Boy & Girl, Love Daily, Got to Believe, Search: WWW, and Listening Snow Tower.
Frequently Asked Questions
Where can I watch Undercover High School for free?
You can watch Undercover High School online for free on CineFlixo. All 12 episodes across 1 season are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.
How many seasons and episodes does Undercover High School have?
Undercover High School currently has 1 season and a total of 12 episodes. The series status is "Ended", so the episode count may grow as new seasons are released. You can browse the full episode list on CineFlixo and continue watching from where you left off.
What is Undercover High School about?
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. It belongs to the Action & Adventure, Comedy, Drama genres.
In which language is Undercover High School originally available?
Undercover High School was originally produced in KO. On CineFlixo the show is available in its original KO audio. Check the player options on the watch page for available subtitle tracks.
When was Undercover High School first released?
Undercover High School first premiered on February 21, 2025 (2025). The series has since concluded its run.
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