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Undercover High School

8.0 IMDb tt33364760 2025 Action & Adventure · Comedy · Drama

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

Seo Kang-joon

Jin Ki-joo

Kim Shin-rock

Kim Min-ju

Yoon Ga-i

Kim Young-ah

Lee Hyun So

Yun Chae-bin

The Emperor's Lost Gold

The Emperor's Lost Gold 1h 11m After a botched operation puts Hae-sung and his team in serious jeopardy, the only way for him to…

Spooky Stories

Spooky Stories 1h 7m Hae-sung comes dangerously close to blowing his cover while searching for the hidden gold in Byeongmun High School's…

Ghost Story Riddles

Ghost Story Riddles 1h 9m Hae-sung uncovers a crucial clue hidden within the old building, but Chairwoman Seo quickly learns its potential connection…

Joining the Student Council

Joining the Student Council 1h 6m Hae-sung attends the anti-bullying committee session with a key witness who clears his name, while Dong-min finally finds…

Student Council

Student Council 1h 8m Hae Seong and the team grow increasingly concerned that Su A's suspicions could threaten his undercover mission. However,…

Hye Seong's Father's Notebook

Hye Seong's Father's Notebook 1h 10m The school's security guard dies, leaving Hae Seong a notebook belonging to his missing father. The revelation is…

The 24th Anniversary of Byeongmun High School

The 24th Anniversary of Byeongmun High School 1h 5m Hae Seong is caught off guard when he recognises Su A's childhood name, Bong Ja, which stirs memories…

The Plan for VIP Students

The Plan for VIP Students 1h 10m After uncovering the possibility of a mole within the NIS, Hae Seong becomes increasingly distrustful of those around…

The Mathematics Teacher

The Mathematics Teacher 1h 8m As Su A recovers in the hospital following the attack during the break-in, Hae Seong and the team…

Retribution

Retribution 1h 7m To everyone's shock, Seo Myeong Ju returns to the school. Unimpressed by Hae Seong, she expels him and…

The Devastating Truth

The Devastating Truth 1h 8m The gold bars vanish just as they are within reach, and Seo Myeong Ju suspects Hae Seong has…

Where The Stars Lead

Where The Stars Lead 1h 9m Despite getting badly injured, Hae Seong manages to call Su A and his team. They conclude that the…

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