Genre: Crime, Investigation, Action, Coming-of-Age, Romantic Comedy, School
Channel: MBC
Streaming: KOCOWA+, Viu, Rakuten Viki
Starring: Seo Kang-joon, Jin Ki-joo, Kim Shin-rok
Teaser: https://www.youtube.com/watch?v=ymUyqgdEEgY
“The greatest virtue that a school can offer is the opportunity to build friendships.”
— Poet Park No-hae.
In South Korea, Byungmun High School is an elite private institution where status is dictated by wealth and background.
No one spares a glance for the weak, corruption and power struggles run rampant, and only results and personal gain matter.
It’s a microcosm of modern society—rotten to the core.
One day, a new student transfers in. His name: Jung Haeseong.
But he’s no ordinary high schooler—he’s an undercover National Intelligence Service (NIS) agent.
To the untrained eye, the school seems normal. But beneath the surface, it’s a battlefield of ambition, where parents, students, and faculty alike claw for power.
Haeseong infiltrates the school in search of the hidden gold of Emperor Gojong.
But things don’t go as planned—he keeps getting tangled up with his classmates and the school’s politics.
A desk mate with a past eerily similar to his own.
A cheerful younger sister hiding deep worries behind her smile.
A teacher—once his childhood friend and first love.
This isn’t just a story about hunting for treasure.
It’s about an enigmatic student who appears out of nowhere, forms friendships, finds solidarity, and grows alongside his peers.
It’s about standing up against a corrupt system—a society as twisted as the school itself.
Thrilling, hilarious, and sometimes deeply moving.
The mission begins: UNDERCOVER HIGH SCHOOL.