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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.
Movie rating: 7.9 / 10 (2152)
Season: #1
Cast: Seo Kang-joon - Jin Ki-joo - Kim Min-ju
AKA: Eon-deo-keo-beo Ha-i-seu-kul, Eondeokeobeo Haiseukul, Undercover High School
