Undercover High School poster
Where to stream

Undercover High School

8.020251 seasonTV SeriesAction & 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.

DirectorChoi Jeong-in
WriterIm Young-bin

Where to watch

HBO MaxHBO MaxViuViu
Availability shown for Philippines · rights vary by country

Seasons & Episodes

E1
The Emperor's Lost Gold
Feb 21, 2025 8.0
E2
Spooky Stories
Feb 22, 2025 8.0
E3
Ghost Story Riddles
Feb 28, 2025 8.0
E4
Joining the Student Council
Mar 1, 2025 8.0
E5
Student Council
Mar 7, 2025 8.2
E6
Hye Seong's Father's Notebook
Mar 8, 2025 8.0
E7
The 24th Anniversary of Byeongmun High School
Mar 14, 2025 8.2
E8
The Plan for VIP Students
Mar 15, 2025 8.1
E9
The Mathematics Teacher
Mar 21, 2025 9.0
E10
Retribution
Mar 22, 2025 8.8
E11
The Devastating Truth
Mar 28, 2025 8.3
E12
Where The Stars Lead
Mar 29, 2025 8.7

Cast · Directed by Choi Jeong-in

SKSeo Kang-joon
Seo Kang-joon
Jeong Hae-sung
JKJin Ki-joo
Jin Ki-joo
Oh Su-ah
KSKim Shin-rock
Kim Shin-rock
Seo Myung-ju
KMKim Min-ju
Kim Min-ju
Lee Ye-na
YGYoon Ga-i
Yoon Ga-i
Park Mi-jung
KYKim Young-ah
Kim Young-ah
Im Chung-ha
LSLee Hyun So
Lee Hyun So
Han Seung-jae
YCYun Chae-bin
Yun Chae-bin
Yun Chae-rin
KSKim Sun-min
Kim Sun-min
Ji Hyeon-jun
KSKim Seung-beom
Kim Seung-beom
Kim Ho-jin
KPKang Pil-jun
Kang Pil-jun
Son Beom-Sik

More from Seo Kang-joon · Lead actor

A Love Other Than Yours
A Love Other Than Yours
2026 · 8.0
KBS Drama Special
KBS Drama Special
2010 · 7.4
Boyfriend on Demand
Boyfriend on Demand
2026 · 8.4
Are You Human?
Are You Human?
2018 · 8.1
Busted!
Busted!
2018 · 7.8
When the Weather Is Fine
When the Weather Is Fine
2020 · 7.3
The Third Charm
The Third Charm
2018 · 6.2
Hwajung
Hwajung
2015 · 4.5
The Suspicious Housekeeper
The Suspicious Housekeeper
2013 · 5.0
Good Doctor
Good Doctor
2013 · 8.0
See all fromSeo Kang-joon

More from Jin Ki-joo · Co-star actress

Teach You a Lesson
Teach You a Lesson
2026 · 9.4
Scarlet Heart: Ryeo
Scarlet Heart: Ryeo
2016 · 8.5
Sh**ting Stars
Sh**ting Stars
2022 · 8.1
The Secret Life of My Secretary
The Secret Life of My Secretary
2019 · 7.5
Splash Splash Love
Splash Splash Love
2015 · 7.9
From Now On, Showtime!
From Now On, Showtime!
2022 · 7.6
Uncle Samsik
Uncle Samsik
2024 · 7.4
Midnight
Midnight
2021 · 7.2
Wednesday 3:30 PM
Wednesday 3:30 PM
2017 · 7.3
Homemade Love Story
Homemade Love Story
2020 · 6.0
See all fromJin Ki-joo

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Undercover High School — streaming FAQ

Which OTT platform streams Undercover High School?

Undercover High School is streaming on HBO Max and Viu in Philippines. It's not currently on Netflix.

Is Undercover High School on Netflix?

No, Undercover High School is not on Netflix in Philippines as of September 2026. It's currently on HBO Max and Viu.

Is Undercover High School on Amazon Prime Video?

No, Undercover High School isn't on Amazon Prime Video in Philippines right now. It's on HBO Max and Viu instead.

Where can I watch Undercover High School for free?

Undercover High School is available to stream free (with ads) on Viu in Philippines.

How many seasons are in Undercover High School?

Undercover High School has 1 season in total (12 episodes). The series concluded in 2025.

Are all episodes of Undercover High School out yet?

Yes — all 12 episodes across 1 season of Undercover High School are out and available to stream.

Is there a Season 2 of Undercover High School?

No — Undercover High School ended after 1 season, so there is no Season 2.