Where can I watch Undercover High School for free?

Watch Undercover High School free in HD on Castle. Download the Castle App to stream all seasons and episodes with Hindi audio — no subscription, no signup needed.

How many seasons of Undercover High School are available on Castle?

Castle has all 1 seasons of Undercover High School, with a total of 12 episodes streaming free in HD.

What languages is Undercover High School available in?

On Castle, Undercover High School is available in Hindi, all in HD.

Who stars in Undercover High School?

Undercover High School stars Seo Kang-Joon, Ki-joo Jin, Kim Min-ju, Kim Shin-rock.

When did Undercover High School first premiere?

Undercover High School premiered on 2025-02-21 and is now streaming free on Castle.

Is the Castle App safe to download?

Yes. The Castle APK is a verified safe file. It requires only basic Android permissions and does not need root access. Compatible with Android 6.0 and above.

Undercover High School

2025•12 epsIMDB 7.8

Crafted by None1, Undercover High School Season 1 brings Seo Kang-Joon back alongside Ki-joo Jin in a chapter that refuses to slow down. Set against South Korea, the season unravels 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 fi… with action storytelling across 12 episodes, exploring themes of action in ways that elevate the series to new heights.