Have you heard which K-drama is currently taking over? That’s right—it’s none other than Seo Kang Jun and Jin Ki Joo’s action-comedy thriller, Undercover High School!

Starring Seo Kang Jun, Jin Ki Joo, Kim Shin Rok, and Kim Min Ju, this drama follows a top National Intelligence Service (NIS) agent who gets demoted and sent on an undercover mission at a high school. But here’s the catch—he’s not posing as a teacher or staff member. Instead, he has to pretend to be an actual high school student!

Why “Undercover High School” Should Be Your Next K-Drama Watch

1. A Hilarious Concept: A NIS Agent Going Undercover as a High School Student

One of the biggest reasons “Undercover High School” is a must-watch is its one-of-a-kind concept—a top NIS agent disguised as a high school student. This premise alone makes it stand out from other K-dramas!

The story kicks off with an elite NIS squad assigned to recover a missing national treasure then our main character, Jeong Hae Seong, successfully retrieves it… but ends up destroying it in the process. As punishment, he’s forced to go undercover as a student. Now, this 30-year-old agent has to blend in with actual teenagers while keeping up with high school academics—a challenge that leads to endless hilarious moments. Watching him struggle to fit in while secretly carrying out his mission makes for some of the best comedic scenes in the drama!

2. Unexpected Horror Elements

While “Undercover High School” is an action thriller, it surprisingly comes with a horror subplot—something we didn’t see coming!

We’ve all heard creepy stories about haunted high schools, and this drama brings those legends to life. As part of his mission, Hae Seong must track down the missing national treasure, which leads him deep into the school’s mysterious history. The school’s founder is somehow linked to the missing gold, and uncovering the truth means digging into abandoned areas of the campus.

As Hae Seong investigates, he stumbles upon chilling ghost stories that serve as clues in his mission. These eerie tales push him to make strategic moves—like joining the student council to get closer to an old wooden clock, a key object in one of the school’s most infamous ghost stories. The mix of mystery, thriller, and horror adds an exciting twist that keeps us on the edge of our seats!

3. One of the Most Chaotic Main Couples and Squads in K-Drama

Since our main character is a demoted NIS agent, he has to learn Gen Z slang to blend in—which is a struggle, considering he’s from a completely different generation. One of the funniest moments is when he’s asked about his favorite girl group, and he confidently answers Girls’ Generation—making everyone realize just how he’s such an oldie! Plus, we even get to see Seo Kang Jun dancing, adding to the comedy gold. Everything about him is just hilariously out of place!

Our female lead is just as chaotic! She’s Jeong Hae Seong’s homeroom teacher, but what they don’t know is that they actually met when they were kids. She’s a strong and fearless teacher who never backs down when her students are mistreated. However, just like Hae Seong, she has her own quirky mannerisms—especially when she’s drunk. In fact, her drunken antics often lead to unexpected (and hilarious) run-ins with Hae Seong, whom she mistakenly believes isn’t a student, as well as with the other undercover NIS agents!

And let’s not forget the NIS undercover squad, who are just as chaotic. Their mission requires them to run a restaurant as a cover-up, but things spiral out of control when Oh Su Ah (the female lead) catches them acting suspiciously with Hae Seong. This squad is the perfect support system for Hae Seong, helping him navigate high school life while desperately trying to complete their mission as soon as possible.

4. High Ratings and Massive Popularity in South Korea

Undercover High School” is currently the hottest K-drama of the moment! It ranks #1 on the ‘Most Buzzworthy Dramas’ list for both TV and OTT platforms, while Seo Kang Jun and Jin Ki Joo also landed on the ‘Most Buzzworthy Actors and Actresses’ list at #1 and #8, respectively.

The drama is also receiving great TV ratings, with its recent episodes soaring past 8%! Clearly, both Korean and international audiences are loving the mix of action, comedy, and mystery in this unique undercover story.

What to Look Forward to in the Next Episodes?

There are still so many mysteries left to uncover—including the truth behind Jeong Hae Seong’s past, what really happened to his missing father, and whether the legendary missing gold bars even exist. And the biggest question of all: Will Oh Su Ah finally discover that Hae Seong isn’t actually a student but an undercover NIS agent?

The answers are waiting in the next episodes, so don’t miss out! And the best part? You don’t have to search far—it’s streaming on KOCOWA+ with multiple subtitle options!

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