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Undercover High School (Eon-deo-keo-beo Ha-i-seu-kul) - 2025
2025
4.1
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.
Actors: