⭐ Undercover High School (2025) ⭐
Type: Drama
Format: Standard Series
Country: South Korea
Episodes: 12
Aired: Feb 21, 2025 – Mar 29, 2025
Aired On: Friday, Saturday
Genres: Action, Comedy, Romance, Crime
Duration: 1 hr. 10 min.
Content Rating: 15+ – Teens 15 or older
📌 Synopsis
Jung Hae Seong, an elite NIS agent on the verge of demotion, is assigned to go undercover at Byeongmun High School to uncover the location of King Gojong’s missing gold bars. Disguised as a student, he meets O Su A, a passionate contract Korean history teacher aspiring to become a full-time faculty member. As their bond deepens, Hae Seong discovers corruption festering within the school. With unexpected allies, he takes on powerful forces to expose the truth.
🎭 Cast
⭐ Main Cast
Seo Kang Jun as Jung Hae Seong / Jung Si Hyeon
Jin Ki Joo as O Su A / O Bong Ja
Kim Shin Rok as Seo Myeong Ju
🟦 Support Cast
Jeon Bae Soo as An Seok Ho [NIS team 4 team leader] Jo Bok Rae as Ko Yeong Hun [NIS team 4 agent] Yoon Ga Yi as Park Mi Jeong [NIS team 4 agent] Lee Seo Hwan as Kim Hyeong Bae [NIS director] Im Chul Hyung as Kong Jin Sang [NIS team 1 team leader] Kim Min Ju as Lee Ye Na [Student council president] Park Se Hyun as An Yu Jeong [Seok Ho’s daughter] Jang Sung Bum as Park Tae Su [Student council member] Lee Hyun So as Han Seung Jae [Student council member] Kim Sun Min as Ji Hyeon Jun [Student council vice president] Shin Jun Hang as Lee Dong Min [Student] Jeong Soo Hyun as Im Yun Cheol [Student] Kang Pil Jun as Son Beom Sik [Student] Shin Ga Eun as Choi Su Jin [Student] Kim Seung Beom as Kim Ho Jin [Informant] Park Jin U as Park Jae Mun [Byeongmun high school president] Oh Yong as Baek Gwang Do [Superintendent] Lee Min Ji as Kim Ri An [P.E. teacher] Noh Jong Hyun as Lee Jun Ho [Math teacher] Kim Young Ah as Im Cheong Ha [Su A’s mother] Kim Soo Jin as Jang Man Ok [Seok Ho’s wife] Yun Chae Bin as Yun Chae Rin [Student]
🟨 Guest Cast
Kim Eui Sung as Seo Byeong Mun [Former principal] (Ep. 1)
Li Yong Qun as Blackmarket buyer (Ep. 1)
Kyung Ki Hyun as Restaurant hoodlum (Ep. 1)
Oh Eui Shik as Jung Jae Hyun [Hae Seong’s father] (Ep. 1–2, 5–7, 11–12)
Shin Dam Soo as Park Min Cheol [Assemblyman] (Ep. 1, 3–4)
Kang Soo Bin as Bully student (Ep. 2)
Jang Se Rim as Bully student (Ep. 2)
Jo Jae Yoon as Koo Sang Tae [Boss] (Ep. 2–4)
Shin Yeon Suk as Choi Bok Sun [Dong Min’s grandma] (Ep. 2–3)
Koo Min Hyuk as Kim Hyeon Ho [Security guard] (Ep. 2–3, 5–6)
Yu Ji Wan as Jung Hae Seong [Child] (Ep. 2, 4–7, 9, 11–12)
Lee Dong Gi as Kang Seong U [Bully] (Ep. 3)
Yong Jin as Detective (Ep. 3)
Baek Kil Sung as Seong U’s dad (Ep. 3)
Park Jung Eon as Student’s mom (Ep. 3)
Lee Bum Chan as Ye Na’s driver (Ep. 3, 5)
Su Hyun as Student (Ep. 4)
Ahn Nae Sang as Neighborhood resident (Ep. 4)
Park Seol Ha as O Su A [Child] (Ep. 4–7)
Kwon Tae Won as Chief editor Yun (Ep. 5)
Kim Sung Yong as CCTV room staff (Ep. 5)
Lee Hwi Seo as Piano student (Ep. 6)
Yoo Dam Yeon as Ms. Do [Student’s parent] (Ep. 7–8)
Joo Seok Tae as Seung Jae’s dad (Ep. 7–8)
Lee Seo Young as Park Min Ji [Su A’s student] (Ep. 8, 12)
Kim Dae Geun as Gang member (Ep. 10)
Kim Nak Gyun as Internal affairs officer (Ep. 10)
Chae Hoon as Gangster (Ep. 1)
💭 Final Thoughts
“Undercover High School” delivers action-packed thrills, humor, school mysteries, and heartfelt moments, combining undercover missions with emotional character stories.
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