▶ Trailer

Undercover High School

1 season · 2025 · Ended

★★★★★4.0

Action & AdventureComedyDrama

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

All seasons

The Emperor's Lost Gold

S01 · E01 The Emperor's Lost GoldFebruary 21, 2025

Spooky Stories

S01 · E02 Spooky StoriesFebruary 22, 2025

Ghost Story Riddles

S01 · E03 Ghost Story RiddlesFebruary 28, 2025

Joining the Student Council

S01 · E04 Joining the Student CouncilMarch 1, 2025

Student Council

S01 · E05 Student CouncilMarch 7, 2025

Hye Seong's Father's Notebook

S01 · E06 Hye Seong's Father's NotebookMarch 8, 2025

The 24th Anniversary of Byeongmun High School

S01 · E07 The 24th Anniversary of Byeongmun High SchoolMarch 14, 2025

The Plan for VIP Students

S01 · E08 The Plan for VIP StudentsMarch 15, 2025

The Mathematics Teacher

S01 · E09 The Mathematics TeacherMarch 21, 2025

Retribution

S01 · E10 RetributionMarch 22, 2025

The Devastating Truth

S01 · E11 The Devastating TruthMarch 28, 2025

Where The Stars Lead

S01 · E12 Where The Stars LeadMarch 29, 2025

Cast

Seo Kang-joon

Seo Kang-joonJeong Hae-sung

Jin Ki-joo

Jin Ki-jooOh Su-ah

Kim Shin-rock

Kim Shin-rockSeo Myung-ju

Kim Min-ju

Kim Min-juLee Ye-na

Yoon Ga-i

Yoon Ga-iPark Mi-jung

Kim Young-ah

Kim Young-ahIm Chung-ha

Lee Hyun So

Lee Hyun SoHan Seung-jae

Yun Chae-bin

Yun Chae-binYun Chae-rin

Kim Sun-min

Kim Sun-minJi Hyeon-jun

Kim Seung-beom

Kim Seung-beomKim Ho-jin

Kang Pil-jun

Kang Pil-junSon Beom-Sik