Undercover High School

March 24, 2025

Seasoned NIS agent Jae-hyun is assigned to go undercover as a high school student to protect the daughter of a key witness. The NIS building area in Naegok-dong establishes the mission's stakes.

March 25, 2025

Jae-hyun attends class for the first time in twenty years. The Mapo-gu high school exterior is where he tries — and largely fails — to look like a teenager.

March 31, 2025

High school social structure is more dangerous than any mission Jae-hyun has survived. He approaches it with the tactical seriousness of a counter-terrorism operation.

April 1, 2025

The girl he is protecting begins to suspect something is not right about the new transfer student. She is correct.

April 7, 2025

Jae-hyun must maintain his student cover while responding to a real threat. The school building becomes an action set.

April 8, 2025

The drama's funniest episode: an extended lunch scene where Jae-hyun must navigate the social ritual of who sits where without triggering a diplomatic incident.

April 14, 2025

A teacher becomes suspicious. Jae-hyun must deflect an adult who is actually paying attention.

April 15, 2025

The girl he is protecting decides to trust him — for reasons that have nothing to do with his cover story.

April 21, 2025

The threat to the witness's family moves from abstract to immediate. The school is no longer safe.

April 22, 2025

A tense extraction sequence through the Mapo-gu streets adjacent to the school.

April 28, 2025

The mission is almost compromised. Jae-hyun must choose between operational security and something that has become, against all training, personal.

April 29, 2025

The finale. Named one of TIME's 10 best K-dramas of 2025 for its sustained comic invention and surprising emotional sincerity.