Undercover High School (Season 1)

Undercover High School (언더커버 하이스쿨, 2025) is a South Korean action comedy series you can watch online on iFILM, starring So Gang-jun as an elite NIS agent forced back to basics — high school, to be precise — after a mission goes wrong.

Jung Hae-seong goes undercover as a student to track down Emperor Gojong's missing gold, which is somehow connected to one ordinary Seoul high school. The job description is already absurd. Then it gets worse: the school's top student, Ye-na, immediately marks him as suspicious and starts digging, while his homeroom teacher turns out to be a woman from his past he wasn't prepared to face again.

The series works because it commits to both sides of its premise — the spy thriller mechanics are played straight enough to generate real stakes, while the school comedy layers pile up fast and genuinely earn the laughs. For fans of Korean romantic action dramas that don't take themselves too seriously, this one moves quickly and doesn't overstay its welcome. Stream Undercover High School (2025) online on iFILM.