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Undercover High School
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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.
Highest-rated episodes all ranked
- 01
The Mathematics TeacherAs 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. - 02
RetributionTo 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 - 03
Where The Stars LeadDespite 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.
Castfull cast & details
Episodes by season
Season01
- S01E01
The Emperor's Lost GoldFebruary 21, 2025After 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 - S01E02
Spooky StoriesFebruary 22, 2025Hae-sung comes dangerously close to blowing his cover while searching for the hidden gold in Byeongmun High School's eerie old building, bar - S01E03
Ghost Story RiddlesFebruary 28, 2025Hae-sung uncovers a crucial clue hidden within the old building, but Chairwoman Seo quickly learns its potential connection to the elusive g - S01E04
Joining the Student CouncilMarch 1, 2025Hae-sung attends the anti-bullying committee session with a key witness who clears his name, while Dong-min finally finds the courage to sta - S01E05
Student CouncilMarch 7, 2025Hae Seong and the team grow increasingly concerned that Su A's suspicions could threaten his undercover mission. However, Hae Seong defies t - S01E06
Hye Seong's Father's NotebookMarch 8, 2025The school's security guard dies, leaving Hae Seong a notebook belonging to his missing father. The revelation is shocking, and he storms th - S01E07
The 24th Anniversary of Byeongmun High SchoolMarch 14, 2025Hae 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 fr - S01E08
The Plan for VIP StudentsMarch 15, 2025After uncovering the possibility of a mole within the NIS, Hae Seong becomes increasingly distrustful of those around him, causing him to qu - S01E09Season's bestThe Mathematics TeacherMarch 21, 2025As 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 mathe
- S01E10RetributionMarch 22, 2025To everyone's shock, Seo Myeong Ju returns to the school. Unimpressed by Hae Seong, she expels him and demonstrates her power by dismantling
- S01E11
The Devastating TruthMarch 28, 2025The 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 heartbrea - S01E12Where The Stars LeadMarch 29, 2025Despite getting badly injured, Hae Seong manages to call Su A and his team. They conclude that the only evidence they can secure is the flas
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