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Undercover High School

Undercover High School

2025 ★ 8.0 1 Seasons Action & Adventure Comedy Drama

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Overview

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.

Episodes

Seasons 1

Seasons 1

The Emperor's Lost Gold

Undercover High School

S01E01 2025-02-21

The Emperor's Lost Gold

After a botched operation puts Hae-sung and his team in serious jeopardy, the only way for him to s...

Spooky Stories

Undercover High School

S01E02 2025-02-22

Spooky Stories

Hae-sung comes dangerously close to blowing his cover while searching for the hidden gold in Byeong...

Ghost Story Riddles

Undercover High School

S01E03 2025-02-28

Ghost Story Riddles

Hae-sung uncovers a crucial clue hidden within the old building, but Chairwoman Seo quickly learns...

Joining the Student Council

Undercover High School

S01E04 2025-03-01

Joining the Student Council

Hae-sung attends the anti-bullying committee session with a key witness who clears his name, while...

Student Council

Undercover High School

S01E05 2025-03-07

Student Council

Hae Seong and the team grow increasingly concerned that Su A's suspicions could threaten his underc...

Hye Seong's Father's Notebook

Undercover High School

S01E06 2025-03-08

Hye Seong's Father's Notebook

The school's security guard dies, leaving Hae Seong a notebook belonging to his missing father. The...

The 24th Anniversary of Byeongmun High School

Undercover High School

S01E07 2025-03-14

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 memori...

The Plan for VIP Students

Undercover High School

S01E08 2025-03-15

The Plan for VIP Students

After uncovering the possibility of a mole within the NIS, Hae Seong becomes increasingly distrustf...

The Mathematics Teacher

Undercover High School

S01E09 2025-03-21

The Mathematics Teacher

As Su A recovers in the hospital following the attack during the break-in, Hae Seong and the team u...

Retribution

Undercover High School

S01E10 2025-03-22

Retribution

To everyone's shock, Seo Myeong Ju returns to the school. Unimpressed by Hae Seong, she expels him...

The Devastating Truth

Undercover High School

S01E11 2025-03-28

The Devastating Truth

The gold bars vanish just as they are within reach, and Seo Myeong Ju suspects Hae Seong has them....

Where The Stars Lead

Undercover High School

S01E12 2025-03-29

Where The Stars Lead

Despite getting badly injured, Hae Seong manages to call Su A and his team. They conclude that the...

Cast

Seo Kang-joon

Seo Kang-joon

Jeong Hae-sung

Jin Ki-joo

Oh Su-ah

Kim Shin-rock

Kim Shin-rock

Seo Myung-ju

Kim Min-ju

Lee Ye-na

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

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