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Undercover High School

Undercover High School
★ 8.0/10•2025•1h 10m•15•Action & Adventure•Comedy•Drama
Similars

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.

Im Young-bin · Writer

Choi Jeong-in · Director

StatusEnded
Runtime1h 10m
LanguageKO
First Air DateFeb 21, 2025

Episodes

Episode 1 - The Emperor's Lost GoldE171m

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.

Feb 21, 2025

Episode 2 - Spooky StoriesE267m

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.

Feb 22, 2025

Episode 3 - Ghost Story RiddlesE369m

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.

Feb 28, 2025

Episode 4 - Joining the Student CouncilE466m

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.

Mar 1, 2025

Episode 5 - Student CouncilE568m

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

Mar 7, 2025

Episode 6 - Hye Seong's Father's NotebookE670m

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

Mar 8, 2025

Episode 7 - The 24th Anniversary of Byeongmun High SchoolE765m

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

Mar 14, 2025

Episode 8 - The Plan for VIP StudentsE870m

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

Mar 15, 2025

Episode 9 - The Mathematics TeacherE968m

The Mathematics Teacher

As Su A recovers in the hospital following the attack during the break-in, Hae Seong and the team uncover the culprit: Lee Jun Ho, the mathematics teacher. When Hae Seong detects his father's notebook missing, he realizes that Seo Myeong Ju orchestrated the break-in. After Lee Jun Ho's arrest and confession, the revelation of the school's grade-rigging scandal throws the institution into chaos. Amid the turmoil, Hae Seong stumbles upon a crucial clue to the final scary story.

Mar 21, 2025

Episode 10 - RetributionE1067m

Retribution

To everyone's shock, Seo Myeong Ju returns to the school. Unimpressed by Hae Seong, she expels him and demonstrates her power by dismantling his team. However, refusing to back down, Hae Seong and the team, including Su A and her mother, devise a daring plan to infiltrate the school once more to retrieve the hidden gold bars

Mar 22, 2025

Episode 11 - The Devastating TruthE1168m

The Devastating Truth

The gold bars vanish just as they are within reach, and Seo Myeong Ju suspects Hae Seong has them. In the vault, Hae Seong makes a heartbreaking discovery of his father's remains. Overcome with grief, he finally finds closure, but a shocking truth emerges. He learns Director Kim Hyung Bae was behind it all. Determined to uncover the whole story, Hae Seong heads to confront him alone.

Mar 28, 2025

Episode 12 - Where The Stars LeadE1269m

Where The Stars Lead

Despite getting badly injured, Hae Seong manages to call Su A and his team. They conclude that the only evidence they can secure is the flash drive that contains the voice recording of Principal Park murdering Director Kim Hyung Bae. After finding out that an arrest warrant had been issued for her, Seo Myeong Ju decides to take a special measure to end everything.

Mar 29, 2025

Actors

Seo Kang-joon

Seo Kang-joon

Jeong Hae-sung

Jin Ki-joo

Jin Ki-joo

Oh Su-ah

Kim Shin-rock

Kim Shin-rock

Seo Myung-ju

Kim Min-ju

Kim Min-ju

Lee Ye-na

Yoon Ga-i

Yoon Ga-i

Park Mi-jung

Kim Young-ah

Kim Young-ah

Im Chung-ha

Lee Hyun So

Lee Hyun So

Han Seung-jae

Yun Chae-bin

Yun Chae-bin

Yun Chae-rin

Kim Sun-min

Kim Sun-min

Ji Hyeon-jun

Kim Seung-beom

Kim Seung-beom

Kim Ho-jin

Kang Pil-jun

Kang Pil-jun

Son Beom-Sik

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