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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 first love, stirring old heartbreak.
Availability by JustWatch · All options on TMDB
| Platform | Score | Points |
|---|---|---|
| IMDb4,734 votes | 7.7 | 7 pts |
| Rotten Tomatoes | not available | skipped |
Scores from IMDb. Updated weekly.
4,734 votes across 1 platformUndercover High School (2025) has a Lantern Score of 7.7, from IMDb 7.7. Stream it in the US on Rakuten Viki, OnDemandKorea, Kocowa Amazon Channel.